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Worksheets

ELECTRICITY

Total questions: 206

Worksheet time: 3hrs 39mins

Name
Class
Date
1.
Voltage is measured in __.
a)
volts.
b)
watts.
c)
coulombs. 
2.

What is the current in an electric circuit?

a)

The energy of the circuit

b)

The flow of electrons in the circuit

c)

The power of the circuit

3.

Current has units:

a)

volt

b)

ampere

c)

coulomb

4.

What is Resistance?

a)

The flow of electrons

b)

Electric potential difference

c)

A measure of the opposition to current flow in an electrical circuit.

5.

What is resistance measured in?

a)

Ω (Ohms)

b)

V (Volts)

c)

A (Amps)

6.

What 'flows' in a wire?

a)

Protons

b)

Neutrons

c)

Electrons

7.

A student uses a length of wire as a resistor. He makes a second resistor from the same material.

To be certain of making a second resistor of higher resistance, he should use a piece of wire that is:

a)

longer and thicker.

b)

longer and thinner.

c)

shorter and thicker.

8.

As the resistance of a circuit increases, the current will...

a)

Increase

b)

decrease

c)

stay the same

9.

Which equation can be used to calculate the resistance R of a resistor?

a)

V = I / R

b)

I = V x R

c)

V = I x R

10.

What would the circuit resistance be if a 7 Amp draw was present with the engine running and the charging system producing 14 Volts

a)

15 Ohms

b)

4 Ohms

c)

2 Ohms

11.

This circuit has a 24 volt battery and the resistor is 8 ohms. How many amps are running through the circuit?

a)

3 Amps

b)

4 Amps

c)

2 Amps

12.

If the current through a circuit is 2 A and the resistance of a light bulb in the circuit is 10 Ohms, what is the voltage difference across the light bulb?

a)

5 V

b)

12 V

c)

20 V

13.
Which best describes a parallel circuit?
a)
Electricity flows along one pathway.
b)
The flow of electricity comes from one source. 
c)
Electricity flows along more than one pathway. 
d)
The flow of electricity comes from more than one source. 
14.
What kind of circuit is this?
a)
series
b)
parallel
15.

In a parallel circuit, if one connection is broken, all of the connections stop working.

a)

True.

b)

False.

16.

Which statement is true?

a)

The light bulb will light up because the circuit is complete.

b)

The light bulb will light up because the circuit is broken.

c)

The light bulb will not light up because the circuit is complete.

d)

The light bulb will not light up because the circuit is open.

17.

What type of circuit is the image showing?

a)

Parallel

b)

Series

c)

No circuit

18.
A Charging system producing 14.5 Volts with a current flow of 43.5 Amps, what is the circuit resistance
a)
58 Amps
b)
0.33 Amps
c)
13 Amps
d)
1 Amp
19.
How many Volts would it take to push 1 Amp through a resistance of 1 Ohm
a)
10 volts
b)
1 volt
c)
48 volts
d)
5 volts
20.
What would the circuit resistance be if a 7.5 Amp draw was present with the engine running and the charging system producing 15 Volts
a)
15 Ohms
b)
4 Ohms
c)
0.3333 Ohms
d)
2 Ohms
21.

The tendency for materials to oppose the flow of electricity is known as __________ and is measured using ___________.

a)

resistance, Ohms

b)

current, AMPS

c)

voltage, Volts

22.

A battery uses direct current meaning

a)

the current flows in one direction

b)

the current flows back and forth

23.

True or false: Current in a series circuit is different for each resistor (light bulb).

a)

True

b)

False

24.

The rate of flow of electrons through a wire is known as __________ and is measured using __________.

a)

resistance, Ohms

b)

voltage, Volts

c)

current, AMPS

25.

Light bulbs in a parallel circuit will have

a)

the same brightness

b)

different brightness

26.

True or false: Light bulbs in a series circuit share voltage.

a)

True

b)

False

27.

A resistor

a)

Is the same as resistance

b)

Is connected to a circuit in parallel

c)

Is used in a circuit to control the amount of current

d)

Is not measured in ohms

28.

A conductor has _____ resistance. An insulator has ______ resistance.

a)

Low; high.

b)

Negative; positive.

c)

Positive, negative.

d)

High, low.

29.

Resistance is

a)

Measured using an ammeter

b)

Units are 'volts'

c)

How difficult it is for electrons to move through an object

d)

The continuous movement of electrons in a wire

30.
When more branches are added to a parallel circuit, ____________________.
a)
resistance decreases
b)
voltage increases
c)
nothing changes
31.
What types of charges attract?
a)
Positive and Positive
b)
Positive and Neutral
c)
Negative and Neutral
d)
Positive and Negative
32.

Define Ohm’s Law

a)

a law stating Voltage is equal to the current multiplied by the resistance.

b)

a law stating that electric current is proportional to resistance and inversely proportional to voltage.

33.

A resistor is a device with a constant resistance. Which of the following graphs could represent the voltage across and the current in a resistor? (Remember Ohm's Law: V=IR)

a)

Graph B only

b)

Graphs B and C only

c)

Graph A only

d)

Graphs A, B, and C

34.

Which statement does not characterize electrical conductors?

a)

Conductors allow charges to move freely through them.

b)

Conductors support the flow of electric current.

c)

Metals are examples of electrical conductors.

d)

Conductors have tightly bound outer electrons.

35.

In a parallel circuit, if one connection is broken, all of the connections stop working.

a)

True.

b)

False.

36.

What type of circuit is the image showing?

a)

Parallel

b)

Series

c)

No circuit

37.

What is the role of a multimeter in an electric circuit?

a)

To measure the amount of voltage, current, and resistance. It can also be used to test continuity between two points in an electrical circuit.

b)

To measure the amount of light in an electric circuit

c)

To measure the amount of sound in an electric circuit

38.

This symbol represents a ...........

a)

A snapped wire

b)

Electrical junction

c)

Switch

d)

L.E.D.

39.

What is electromotive force (e.m.f)?

a)

energy used per charge used around the whole circuit

b)

how much a given device resists the flow of electric current

c)

flow of electric charge

d)

none of the above

40.

This symbol represents a .........

a)

Resistor

b)

Battery

c)

Twix

d)

buzzer

41.
What does the arrows in the circuit represents?
a)
conventional current
b)
electron flow
c)
eletromotive force
d)
voltage
42.

A current of 12 A flows for 20 minutes into an electric cooker.


How much charge has the cooker used?

a)

14400 C

b)

280 C

c)

100 C

d)

0.6 C

43.

What is the unit of potential difference (p.d)?

a)

Amperes (A)

b)

Newton (N)

c)

Ohms (Ω)

d)

Volts (V)

44.

TRUE or FALSE: The movement or flow of electrons causes the presence of an electric current.

a)

TRUE

b)

FALSE

45.
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
a)
25 V
b)
10 V
c)
2.5 V
d)
0.4 V
46.
If the Voltage stays the same and Resistance is increased, Current will 
a)
Increase
b)
Decrease
c)
Stay the same
d)
X
47.
The flow of electricity requires a
a)
complete path
b)
incomplete path
c)
insulated current
d)
complex circuit
48.

There is a current of 3.0A in a resistor for time t. During time t, a charge of 120C flows through the resistor.


What is time t ?

a)

0.025 minutes

b)

0.025 s

c)

40 minutes

d)

40 s

49.

How much energy or pushing force available to move electrons through a circuit is known as __________ and is measured using __________.

a)

Resistance, Ohms

b)

Voltage, Volts

c)

Current, AMPS

50.
(Look at picture for question)
a)
A device that opposes the flow of electrons
b)
A device that allows easy flow of electrons
c)
A device that can be used as a battery
d)
Resistors do not exist
51.

A charge of 48 C flows for 6s. What is the current?

a)

8 A

b)

288 A

c)

8 V

d)

288 V

52.

The electrical energy used if a charge of 5 C is supplied by a 12 V cell is....

a)

2.2 A

b)

60 A

c)

2.2 J

d)

60 J

53.

A large lightning bolt can carry up to 120000 A and 350 C. Calculate the time for which the current flows. 

a)

2.92 s

b)

0.0092 s

c)

2.92×10−3 min⁡2.92\times10^{-3}\ \min

d)

2.92×10−32.92\times10^{-3} s

54.

A current of 0.5 A flows in a circuit. Calculate the charge flowing through the circuit in one minute.

a)

0.5 C

b)

30 C

c)

120 C

55.

What is the voltage of a cell if it uses 4.2 J of energy as it pushes 6 C of charge round a circuit?

a)

0.7 v

b)

26 V

c)

0.7 V

d)

26 v

56.
What is the unit of measurement for power?
a)
Joules
b)
Watts
c)
Voltage
d)
Calories
57.
What is the unit of measurement for power?
a)
Joules
b)
Watts
c)
Voltage
d)
Calories
58.

The equation that links energy power and time

a)
Energy = Power / Time
b)
Energy = Time / Power
c)
Power = Energy / Time
d)
Energy = Power x Time
59.

How much energy does a 150W appliance transfer in 10s?

Energy = power x time

a)

2500 J

b)

1500 J

c)

2000 J

d)

1000 Jo

60.

A lamp has a 120 W power rating. It is left on for 30 seconds. How much energy did it use in kJ?

Energy = power x time

a)

3600 kJ

b)

3.6 kJ

c)

450 kJ

d)

20 kJ

61.

How much energy does a 300W appliance transfer in 2 minutes?

Energy = power x time

HINT there are 60s in 1 minute

(a)  

62.

Calculate the power when the energy is 500 J and the time is 10 s.

a)

100 W

b)

250 W

c)

50 W

d)

30 W

63.

A device uses 1000 J of energy in 5 seconds. What is the power of the device?

a)

200 watts

b)

100 watts

c)

500 watts

d)

300 watts

64.

What are the units of measurement for power in the International System of Units (SI)?

a)

joules (J)

b)

watts (W)

c)

volts (V)

d)

ohms (Ω)

65.

What is the formula for calculating power?

a)

P = E/t

b)

P = E - t

c)

P = E + t

d)

P = E x t

66.

Calculate the energy consumed by a 60 W light bulb in 5 hours.

a)

1080 J

b)

1080 kJ

c)

300 J

d)

30O kJ

67.

What is the power of a device that uses 800 J of energy in 4 seconds?

a)

200 W

b)

300 W

c)

400 W

d)

500 W

68.

Calculate the energy consumed by a 75 W light bulb in 6 hours.

a)

2700 J

b)

2700 kJ

c)

450 J

d)

450 kJ

69.

What is the unit of measurement for power in the International System of Units (SI)?

a)

joules (J)

b)

watts (W)

c)

volts (V)

d)

ohms (Ω)

70.
This is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
71.

What is the component labelled A?

a)

Battery

b)

Bell

c)

Light bulb

d)

Switch

72.

What is the component labelled B?

a)

Battery

b)

Bell

c)

Light bulb

d)

Switch

73.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
a battery
d)
a single cell
74.
Which bulbs will light?
a)
1 and 2
b)
2 and 3
c)
3 and 4
d)
4 and 2
75.
a)
Switch (Closed)
b)
Switch (Open)
c)
Bulb
d)
Chassis Ground
76.
If a circuit is incomplete, or broken, it is a(n) ________ circuit. 
a)
closed
b)
series
c)
bad
d)
open
77.
What is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
78.

A device for opening or closing the flow in a circuit is _______.

a)

an insulator

b)

a battery charger

c)

a switch

d)

a resistor

79.
a)
Light
b)
Battery
c)
Motor
d)
Switch (Closed)
80.

Will the light bulb in this circuit light? Why or why not?

a)

yes, because it has two batteries

b)

no, because the switch is open

c)

yes, because it is in a circuit

d)

no, because the bulb is burned out

81.
Electric current is the flow of:
a)
electrons
b)
protons
c)
neutrons
d)
none of these
82.
a)
Wire
b)
Battery
c)
Buzzer
d)
Fuse
83.

This symbol represents a ..........

a)

Bulb

b)

Battery

c)

Buzzer

d)

Microphone

84.

What does this symbol represent?

a)

a fixed resistor

b)

a fuse

c)

a switch

d)

a variable resistor

85.

Which symbol represents a resistor?

a)

A

b)

B

c)

C

d)

D

86.

What does this symbol represent?

a)

a fixed resistor

b)

a fuse

c)

a switch

d)

a variable resistor

87.

What is the component labelled A?

a)

Battery

b)

Bell

c)

Light bulb

d)

Switch

88.

What is the component labelled B?

a)

Battery

b)

Bell

c)

Light bulb

d)

Switch

89.

What is the component labelled C?

a)

Battery

b)

Bell

c)

Light bulb

d)

Switch

90.

What does this symbol represent?

a)

an ammeter

b)

an electric bell

c)

a fixed resistor

d)

a voltmeter

91.

What does this symbol represent?

a)

an ammeter

b)

an electric bell

c)

a fixed resistor

d)

a voltmeter

92.

What kind of circuit is this?

a)

Closed circuit

b)

Parallel circuit

c)

Series circuit

d)

Short circuit

93.

What kind of circuit is this?

a)

Closed circuit

b)

Parallel circuit

c)

Series circuit

d)

Short circuit

94.

The picture is an example of .....

a)

Series Circuit

b)

Parallel Circuit

c)

Alternating Circuit

d)

Active Circuit

95.

The picture is an example of .....

a)

Series Cicuit

b)

Parallel Circuit

c)

Alternating Circuit

d)

Direct Circuit

96.

What use symbols to represent the parts of a circuit, including a source of electrical energy and devices that are run by the electrical energy?

a)

Circuits Diagrams

b)

Ciscuits Drawings

c)

Circuits Pictures

d)

Circuits Lines

97.

In this type of circuit, charge has only one path through which it can flow.

a)

Series Circuit

b)

Parallel Circuit

c)

Alternating Circuit

d)

Direct Circuit

98.

In this kind of circuit, If one element stops functioning in a series circuit, none of the elements can operate.

a)

Series Circuit

b)

Parallel Circuit

c)

Alternating Circuit

d)

Direct Circuit

99.

In this kind of circuit, has two or more paths which charges can flow.

a)

Series Circuit

b)

Parallel Circuit

c)

Alternating Circuit

d)

Direct Circuit

100.

The rate which electrical energy is transform into a different kind of energy is called ....

a)

Series Circuit

b)

Amperes

c)

Electric Power

d)

Ohms

101.

Electric power can be calculated by multiplying ______________ and _________________.

a)

Voltage and resistance

b)

Voltage and current

c)

Electric usage and voltage

d)

Electric Energy and Time

102.

Electrical energy is calculating by multiplying _________________ and ________________.

a)

Electric Power and time

b)

Voltage and time

c)

Resistance and time

d)

Current and time

103.

Who invented series circuita?

a)

Edison

b)

Tesla

c)

Newton

d)

Galileo

104.

Who invented parallel circuits?

a)

Edison

b)

Tesla

c)

Newton

d)

Galileo

105.

Circuit which has 2Volts and 2Amperes in it.

Electric power?

P = I x V

a)

4

b)

6

c)

1

d)

0

106.

Circuit which has 1Volts and 1Amperes in it.

Electric power?

P = I x V

a)

1

b)

2

c)

3

d)

4

107.

A fridge uses 100 kW/h, how much energy would it use in 5 hours?

E= P X T

a)

500kW

b)

600kW

c)

1,000Kw

d)

400kW

108.

A tv uses 20 kW/h, how much energy would it use in 5 hours?

E= P X T

a)

100kW

b)

300kW

c)

1000kW

d)

10kW

109.
In a neutral atom, the number of electrons is equal to the number of _______.
a)
Neutrons
b)
Orbits
c)
Protons
d)
subatomic particles
110.
What charge does an electron have?
a)
negative (-)
b)
positive (+)
c)
neutral or no charge (0)
111.
An object becomes charged when the atoms in the object gain or lose
a)
electrons
b)
protons
c)
neutrons
d)
all of the above
112.
Which type of charge moves from one object to another to cause static electricity?  
a)
Atom
b)
Proton
c)
Electron
d)
Neutron
113.
If two charges repel each other, the two charges must be
a)
Positive and neutra
b)
Positive and negative
c)
positive and neutral
d)
negative and negative
114.

Two balloons are hanging from a stick.

One balloon has a positive charge and the other has a negative charge.

How would you expect the balloons to move?

a)

there would be no movement

b)

towards each other

c)

away from each other

115.

When a balloon is rubbed against a jumper, the jumper transfers electrons to the balloon. What is the charge of the jumper?

a)

Positive

b)

Negative

c)

Neutral

116.
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
a)
friction destroyed electrons in the rod.
b)
the silk has become negatively charged.
c)
protons have moved to the rod.
d)
glass attracts more protons.
117.

1. There are two types of electric charge, positive and ______.

a)

positive

b)

negative

c)

neutral

118.

2. What is the attraction between two like charges?

a)

repel

b)

attract

119.

3. What is the attraction between two different charges?

a)

repel

b)

attract

120.

4. Charging by ________ is done by rubbing two objects at the same time.

a)

induction

b)

induction

c)

convection

d)

friction

121.

5. What is the charge of a neutral object?

a)

zero

b)

positive

c)

negative

122.

6. What will happen when two like charges are brought together?

a)

have no effect on each other

b)

attract each other

c)

repel each other

d)

neutralize each other

123.

7. Which of the following describes the usual way by which a material can gain a negative charge?

a)

losing protons

b)

gaining protons

c)

losing electrons

d)

gaining electrons

124.

8. Electric energy is produced by the movement of _______.

a)

electrons

b)

neutrons

c)

nucleus

d)

protons

125.

9. Which of the following DOES NOT allow electrical charges to flow easily?

a)

copper

b)

metal rod

c)

rubber

d)

silver

126.

10. When an object is positively charged, it has ______.

a)

no protons

b)

no electrons

c)

fewer electrons than protons

d)

more electrons than protons

127.

When two positively charged materials will be placed close together then :

a)

They attract each other

b)

They repel each other

c)

Become negative

d)

Become insulators

128.

What is the equation that links charge (Q), current (I) and time (t)?

a)

Charge = Current x Time, or Q=It

b)

Charge = Current / Time, or Q=I/t

c)

Charge = Time / Current, or Q=t/I

129.

What is charge measured in?

a)

Electrons

b)

Current

c)

Ohms

d)

Coulombs

130.

Complete the equation: Charge = ................ x ..............

a)

Time, Current

b)

Current , Voltage

c)

Resistance, Voltage

d)

Current , Time

131.

Calculate the charge and give the unit when a current of 0.15 A flow around the circuit for 20 seconds.

a)

133.33 C

b)

1.5 C

c)

0.0075 C

d)

3 C

132.

Why must parts of a circuit be properly connected before the bulb can light up?

a)

To ensure that the bulb can light up.

b)

To ensure that the battery can produce light in a closed circuit.

c)

To ensure that electric current can flow through the closed circuit.

133.

What is the definition of electrical current?

a)

The opposition to the flow of electrons

b)

The rate of flow of charge

c)

The work done on each coulomb of charge

d)

Electrons moving around

134.

Current flows through a wire for 3.5 minutes. How many seconds is this?

a)

150

b)

190

c)

210

d)

305

135.

The current in a wire is 1.2kA. What is the current in Amps?

a)

120A

b)

12A

c)

0.12A

d)

1200A

136.

How much charge flows through a wire in 80s if the current is a constant 5.4A?

a)

432C

b)

360C

c)

524C

d)

344C

137.

The total charge that flows though a wire in 25s is 1kC. What is the average current through the wire?

a)

20,000A

b)

0.04A

c)

40A

d)

25A

138.

A 3A current flows through a television. How long would it take for 1500C to flow through it?

a)

4500s

b)

500s

c)

50s

d)

450s

139.

Calculate current if a charge of 10 Coulombs flows past a point in 5 seconds

a)

2 Amps

b)

50 Amps

c)

0.5 Amps

140.

Calculate the charge that passes a point in 20 seconds if 500mA flows for this time.

a)

10 000 Coulombs

b)

25 Coulombs

c)

10 Coulombs

d)

0.025 Coulombs

141.

The correct symbol equation is:

a)

Q = I / t

b)

I = Q x t

c)

t = I / Q

d)

Q = I x t

142.
For a circuit to work the circuit must be…
a)
closed
b)
open
c)
on
d)
charged up
143.
In a single, closed loop (circuit) the current…
a)
is different on each branch
b)
is the same everywhere
c)
varies around the circuit
d)
steps up and down
144.
How much charge must pass by a point in 10 s for the current to be  0.50 A? 
a)
0,05C
b)
5,0C
c)
20C
d)
2,0C
145.

A charge of 48 C flows for 6s. What is the current?

a)

8 A

b)

288 A

c)

8 V

d)

288 V

146.

The electrical energy used if a charge of 5 C is supplied by a 12 V cell is....

a)

2.2 A

b)

60 A

c)

2.2 J

d)

60 J

147.

A current of 0.5 A flows in a circuit. Calculate the charge flowing through the circuit in one minute.

a)

0.5 C

b)

30 C

c)

120 C

148.
Voltage is simply defined as...
a)
what 'pushes' electrons
b)
what 'stops' electrons
c)
moving electrons
149.

Is defined as a continuous flow of electrons.

a)

Resistance

b)

Electric Current

c)

Ohms

d)

Voltage

150.

is a flow of electric charge that regularly

reverses its direction.

a)

Alternating current

b)

Active current

c)

Direct current

d)

Passive current

151.

What is current electricity?

a)

The flow of electrons

b)

Modern electricity

c)

Power

d)

Watts

152.

What is current measured in?

a)

Amps

b)

Volts

c)

Ohms

d)

Coulombs

153.

What device measures current?

a)

Ammeter

b)

Voltmeter

c)

Ohmmeter

d)

Currentometer

154.

Potential Difference is also known as _________

a)

Voltage

b)

Resistance

c)

Energy imbalance

d)

Ampage

155.

Potential difference is measured in what unit?

a)

Volts

b)

Amps

c)

Ohms

d)

Coulombs

156.

What device is used to measure potential difference?

a)

potential difference meter

b)

Voltmeter

c)

Ammeter

d)

Ohmmeter

157.

What is electrical resistance measured in?

a)

Coulombs

b)

Ohms

c)

Volts

d)

Amps

158.

What device is used to measure resistance?

a)

Resistometer

b)

Ohmmeter

c)

Ammeter

d)

Voltmeter

159.

What does this symbol represent?

a)

Circuit break

b)

Fuse

c)

Lamp

d)

Resistor

160.

What does this symbol represent?

a)

Cell

b)

Resistor

c)

Fuse

d)

Switch

161.

What does this symbol represent?

a)

Open Switch

b)

Power Source

c)

Resistor

d)

Fuse

162.

What does this symbol represent?

a)

Battery

b)

Cell

c)

Switch

d)

Fuse

163.

What does this symbol represent?

a)

Resistor

b)

Fuse

c)

Switch

d)

Battery

164.

What does this symbol represent?

a)

Ammeter

b)

Amperes

c)

Anode

d)

A lamp

165.

What does this symbol represent?

a)

Voltage

b)

Voltmeter

c)

Vendetta

d)

Volume

166.

What does this symbol represent?

a)

Fuse

b)

Resistor

c)

Switch

d)

Battery

167.

What does this symbol represent?

a)

Open Switch

b)

Closed Switch

c)

Complete Circuit

d)

Electron Bridge

168.

What is Ohms Law. (Equation)

(a)  

169.

Which of these is not a conductor?

a)

Copper

b)

Gold

c)

Diamond

d)

Sea Water

170.

Which of these is not an insulator?

a)

Dry Wood

b)

Oil

c)

Rubber

d)

Sea water

171.

It is a difference in electric potential energy in joule/coulomb.

a)

A. Circuit

b)

B. Current

c)

C. Resistance

d)

D. Voltage

172.

What is the SI unit of voltage?

a)

A. ampere

b)

B. ohm

c)

C. volt

d)

D. watt

173.

It is the number of charges passing through a wire per unit time.

a)

A. Current

b)

B. Power

c)

C. Resistance

d)

D. Voltage

174.

What is the SI unit of current?

a)

A. ampere

b)

B. ohm

c)

C. volt

d)

D. watt

175.

It is the opposition to the flow of electric charges as they travel through a conducting wire.

a)

A. Circuit

b)

B. Current

c)

C. Resistance

d)

D. Voltage

176.

What is the SI unit of resistance?

a)

A. ampere

b)

B. ohm

c)

C. volt

d)

D. watt

177.

Which of the following is the correct statement of Ohm’s Law?

a)

A. When current increases in a circuit, voltage increases and resistance increases.

b)

B. When current increases in a circuit, voltage decreases and resistance increases.

c)

C. When current decreases in a circuit, voltage decreases and resistance increases.

d)

D. When current increases in a circuit, voltage increases while resistance remains constant.

178.

It supplies energy in an electric circuit.

a)

A. Load

b)

B. Switch

c)

C. Voltage source

d)

D. Conducting wire

179.

It converts electrical energy into different forms of energy such as light, heat, or sound in an electric circuit.

a)

A. Load

b)

B. Switch

c)

C. Voltage source

d)

D. Conducting wire

180.

A water heater has a resistance of 22 Ω connected to a 220-V voltage source. What is the needed current to operate the heater?

a)

A. 5 A B.

b)

7 A

c)

C. 8 A

d)

D. 10 A

181.

A motorcycle starter motor needs 40.0 A to operate with a resistance of 0.150 ohms. What is the needed voltage to start the motor?

a)

A. 5.00 V

b)

B. 6.00 V

c)

C. 7.00 V

d)

D. 8.00 V

182.

A LED TV power adaptor has a 2-mA output and resistance of 900 ohms. What is the voltage output of the adaptor?

a)

A. 2 volts

b)

B. 4 volts

c)

C. 6 volts

d)

D. 8 volts

183.

A laptop power charger has an output of 5.00 volts and has a resistance of 800 ohms. What is the current output of the charger?

a)

A. 6.25 mA

b)

B. 50.0 mA

c)

C. 75.0 mA

d)

D. 80.0 mA

184.

Consider a simple electric circuit with a voltage source of 20.0 V which has a current of 0.500 A. What is the resistance of the load?

a)

A. 20.0 ohms

b)

B. 30.0 ohms

c)

C. 40.0 ohms

d)

D. 50.0 ohms

185.

According to Ohm’s law, across a resistor with constant resistance, what happens to the current across it when the voltage applied is halved?

a)

A. halved

b)

B. doubled

c)

C. quadrupled

d)

D. remains the same

186.

Which pin in a three-pin plug is connected to the earth wire?

a)

The left pin

b)

The right pin

c)

The top pin

d)

The bottom pin

187.

What colour is typically associated with the live wire in a three-pin plug?

a)

Red

b)

Green and Yellow

c)

Blue

d)

Brown

188.

Which of the following is NOT a component of a three-pin plug?

a)

Fuse

b)

Earth Terminal

c)

Transformer

d)

Live Terminal

189.

The cable normally contains how many wires?

a)

1

b)

5

c)

3

d)

4

190.

The neutral wire is covered in what colour insulation

a)

Blue

b)

Green/Yellow

c)

White

d)

Brown

191.

The Green/Yellow wire connects to the

a)

Earth Terminal

b)

Fuse

c)

Cable Cord Grip

d)

Live Terminal

192.

What colour wire is connected to the Fuse

a)

Blue

b)

Green/Yellow

c)

Orange

d)

Brown

193.

The cable cord grip is attached using

a)

Fuses

b)

Pins

c)

Screws

d)

Connectors

194.

If the earth wire is damaged...

a)

The user will suffer from electric shock

b)

The appliance won't work

c)

The appliance will overheat

195.

What colour is the live wire in a three pin plug?

(a)  

196.

What colour is the neutral wire in a three pin plug

(a)  

197.

Green and yellow is colour for (a)   wire

198.

Which label points to the Fuse on the diagram?

(a)  

199.

B is (a)   wire

200.

Which label points to the earth wire on the diagram ?

(a)  

201.

C is label for (a)   wire

202.

When the current through a fuse gets too high, the wire inside the fuse will...

a)

spark

b)

melt

c)

switch OFF

203.

Most electrical appliances are connected to the mains using _____________.

a)

green and yellow stripes

b)

a large electric current

c)

a cable with 3 coloured wires

d)

an open switch

204.

The ________________ covering each wire is colour coded for easy identification.

a)

0 V

b)

insulation

c)

large electric current

d)

neutral wire

205.

The ___________ wire is a safety wire to stop the appliance becoming live.

a)

earth

b)

live

c)

neutral

d)

safe

206.

The earth wire only carries a current when there is a __________ in the appliance.

a)

fire

b)

fault

c)

large electric current

d)

insulation

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