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Unit D Electricity Review

Total questions: 129

Worksheet time: 11hrs 45mins

Name
Class
Date
1.
This image represents what type of circuit.
a)
closed
b)
opened
c)
series 
d)
parallel
2.
Will the light bulb in this circuit light and why/why not?
a)
yes, because it has two batteries.
b)
yes, because it is in a circuit
c)
no, because the switch is open.
d)
no, because the bulb is burned out.
3.
When voltage increases, what happens to the current?
a)
decreases
b)
increases
c)
both increase and decrease
4.
When the resistance increases in a circuit, what happens to the current?
a)
decreases
b)
increases
c)
both
5.
Electricity flows in a:
a)
circuit
b)
current
c)
wire
d)
water
6.
Anything that allows current to flow freely is known as a:
a)
insulator
b)
resistor
c)
conductor
d)
cotton candy
7.
What type of circuit is represented by the diagram?
a)
closed
b)
open
c)
series
d)
parallel
8.
The battery in the image has 12 volts, how many volts does each light bulb receive?
a)
12 volts
b)
3 volts
c)
4 volts
9.
If bulb 1 burns out, what will occur?
a)
bulbs 2 and 3 will go out
b)
bulbs 2 and 3 will stay lit
c)
bulbs 2 and 3 receive more volts
d)
nothing will happen
10.
If a TV works using 30 Amps through the electrical wire with 5 ohms of resistance. How much voltage is needed?
a)
6 V
b)
150 V
c)
35 V
d)
120 V
11.
A alarm clock draws 2 Amps of current when connected to a 120 V circuit.  How much resistance will there be?
a)
60 Ohms
b)
2 Ohms
c)
122 Ohms
d)
240 Ohms
12.

How many volts will bulb C and D receive?

a)

3 V

b)

1 V

c)

1.5 V

d)

6 V

13.

How many volts will bulb A and B both receive?

a)

1. 5 V

b)

6 V

c)

3 V

d)

1 V

14.

A circuit with only "one pathway" for electric current is called a...

a)

Parallel Circuit

b)

Series Circuit

c)

Open Circuit

d)

Short Circuit

15.

A circuit with "two or more pathways" for electric current is called a.....

a)

Parallel Circuit

b)

Series Circuit

c)

Open Circuit

d)

Circuit City

16.
The unit of measurement for resistance is:
a)
Ampere (A)
b)
Volt (V)
c)
Ohm (Ω)
17.

The "pressure" or "push" that moves electrons through a circuit is called:

a)

Resistance

b)

Voltage

c)

Electrical load

d)

Current

18.
Adding another branch to a parallel circuit ______________ the total current in the circuit.
a)
Increases
b)
Decreases
c)
Does not change
19.
Adding another load (such as a light bulb) in a series circuit ______________ the total current in the circuit.
a)
Increases
b)
Decreases
c)
Does not change
20.

If the bulb on the right burned out, what would happen to the bulb on the left?

a)

it would stay lit

b)

it would not light up

c)

it would glow brighter

d)

it would glow dimmer

21.
unit of electric current
a)
watt
b)
ohm
c)
volt
d)
amp
22.

Which of these is a circuit where all the resistors are in series?

a)
b)
c)
d)
23.

In a parallel circuit, what is the same for all the components?

a)

Current

b)

Power

c)

Resistance

d)

Voltage

24.

In a series circuit, what is the same for all the components?

a)

Current

b)

Power

c)

Resistance

d)

Voltage

25.

What would the current be on the bulbs assuming they are identical?

a)

3 amps

b)

2 amps

c)

1 amp

d)

4 amps

26.
Which do you expect to have the brightest light?
a)
1
b)
2
c)
3
d)
4
27.
Which diagram shows two bulbs in a series?
a)
1
b)
2
c)
3
d)
4
28.

Which instrument is used to measure the current (amps) in a circuit?

a)

voltmeter

b)

ammeter

c)

kilometer

29.

which instrument is used to measure the voltage in a circuit?

a)

voltmeter

b)

ammeter

c)

nanometer

30.

What is a device used to protect circuits from an overload of current?

a)

fuse

b)

hot wire

c)

isulator

d)

neutral wire

31.
Why is static electricity not useful as a power source?
a)
Because electrons aren't transferred in bursts of static electricity
b)
Because all energy is released at once in static electricity
c)
Because static electricity is not a real form of electricity
d)
Because static electricity only occurs in lightning
32.
What is a current?
a)
A steady flow of electricity
b)
A short burst of electricity
c)
A wire along which electricity flows
d)
A power source that supplies electricity
33.

Which of the following materials is an electrical conductor?

a)

Plastic spoon

b)

Silver-colored plastic spoon

c)

copper spoon

d)

wooden spoon

34.

Particles with the _________ charge are attracted to each other.

a)

same

b)

opposite

35.

Like charges will _______.

a)

attract

b)

repel

36.

Which of the following is a good insulator?

a)

copper

b)

aluminum

c)

glass

d)

silver

37.

________ electricity is the buildup of charged particles in a material.

a)

current

b)

charge

c)

static

d)

circuit

38.

A(n) ________ is formed when an electric current passes through an unbroken path of conductors.

a)

battery

b)

insulator

c)

surge protector

d)

circuit

39.
a)
Battery
b)
Fuse
c)
Diode
d)
Switch (open)
40.

A microwave oven has a power rating of 600W. If you cook Mac & Cheese for 25 min at high, how many joules of electrical energy are converted into heat by the microwave?

a)

1 440 000 J

b)

15 000 J

c)

900 000 J

d)

123 000 J

41.

Miss Jao's hairdryer has a power rating of 800 W. It is plugged into a 120 V outlet. What is the current flowing through the hairdryer?

a)

8.33 A

b)

6.66 A

c)

96 000 A

d)

96 A

42.

A ___________ is a device that converts electrical energy to another form of energy.

a)

Load

b)

Source

c)

Conductor

d)

Converter

43.

An electric stove is connected to a 250 V outlet. If the current flowing through the stove is 30 A, what is the resistance of the heating element?

a)

12 Ohm

b)

40 Ohm

c)

7500 Ohm

d)

8.3 Ohm

44.

A cellphone has an internal resistance of 50 Ohms. The cellphone is in a circuit of 10.0 A. What is the voltage?

a)

5 V

b)

500 V

c)

50 V

d)

0.5 V

45.

What is the output energy of an electric kettle?

a)

Thermal

b)

Mechanical

c)

Chemical

d)

Electrical

46.
A material that allows electrons to pass easily
a)
insulator
b)
conductor
c)
electric field
d)
static discharge
47.
These three batteries have a total voltage of 9V. What would the new voltage be if you connected another 3V battery?
a)
27V
b)
6V
c)
3V
d)
12V
48.
An object becomes negatively charged by
a)
losing protons
b)
gaining electrons
c)
losing electrons
d)
gaining protons
49.
An object becomes positively charged by
a)
losing protons
b)
gaining electrons
c)
losing electrons
d)
gaining protons
50.
A subatomic particle that has a negative charge
a)
electron
b)
proton
c)
ion
d)
neutron
51.
How many batteries does this circuit have?
a)
1
b)
2
c)
3
d)
0
52.

Which of the following has the greatest resistance?

a)

long, thin wires

b)

Short, thick wires

c)

long, thick wires

d)

short, thin wires

53.

What kind of device turns electrical energy into mechanical energy?

a)

parallel circuit

b)

generator

c)

motor

d)

magnet

54.

Which circuit below contains the greatest voltage?

a)

A circuit with a current of 20 amps and a resistance of 16 ohms

b)

A circuit with a current of 10 amps and a resistance of 10 ohms

c)

A circuit with a current of 25 amps and a resistance of 16 ohms

d)

A circuit with a current of 20 amps and a resistance of 10 ohms

55.
If you wrap more coils around an electromagnet, it will become...
a)
brighter
b)
stronger
c)
weaker
d)
invisible
56.
The renewable energy resources are…
a)
Geothermal, wave, wind, solar, tidal, HEP, Biofuels
b)
Coal, OIl, Gas, Nuclear
c)
Powerstations
d)
Step-up and step-down transformers
57.
The non-renewable energy resources are…
a)
Geothermal, wave, wind, solar, tidal, HEP, Biofuels
b)
Coal, OIl, Gas, Nuclear
c)
Powerstations
d)
Step-up and step-down transformers
58.
The energy resources are weather dependent are…
a)
Solar and wind
b)
Coal, OIl, Gas, Nuclear, Geothermal and HEP
c)
Coal, OIl, Gas and Nuclear
d)
Nuclear and Wind
59.
Which energy resourcs produce carbon dioxide
a)
Coal, OIl, Gas, Biofuels
b)
Nuclear
c)
Solar and wind
60.

In a filament lamp, in what form is most of the energy lost?

a)

Heat

b)

Sound

c)

Kinetic energy

d)

Radio waves

61.

What is power?

a)

The number of repetitions of squats a body-builder can perform

b)

The number of cylinders in a car

c)

The rate at which energy is absorbed

d)

The rate at which energy is transferred

62.

Calculate the power of an appliance that uses 1000 joules of energy in 5 seconds.

a)

100 W

b)

200 W

c)

300 W

d)

400 W

63.

What is the voltage of an appliance if it uses 200 J per second when supplied with a current of 5 A?

a)

10 V

b)

20 V

c)

30 V

d)

40 V

64.

This is the symbol for a...

a)

Motor

b)

Ammeter

c)

Bulb

d)

Voltmeter

65.

This is the symbol for a...

a)

Bulb

b)

Voltmeter

c)

Ammeter

d)

Motor

66.
The SI unit of charge is the
a)
Coulomb
b)
Joule
c)
Watt
d)
Newton
67.

There are two main types of cells, ____________ cells and _______ cells.

a)

super, resistive

b)

dry, wet

c)

cold, hot

d)

damp, not damp

68.

What is an electrolyte?

a)

The liquid part of the electrochemical cell

b)

The metal part of the electrochemical cell

c)

The part that measures the voltage in an electrochemical cell

69.

Different pairs of metals produce different voltages.

a)

True

b)

False

70.
What is the name of the negative contact of a battery?
a)
Anode
b)
Diode
c)
Cathode
d)
Monode
71.
What is the positive contact of the battery called?
a)
Anode
b)
Diode 
c)
Cathode
d)
Monode
72.
Which way do electron flow?
a)
Positive to negative
b)
Negative to positive
c)
Negative to Negative
d)
Positive to Positive
73.

What type of energy transformation occurs when using an electric pencil sharpener?

a)

electrical to mechanical

b)

sound to electrical

c)

mechanical to electrical

d)

potential to sound

74.

What energy transformation occurs when a crock pot is plugged into an outlet and then the control knob is turned "on"?

a)

thermal to electrical

b)

mechanical to thermal

c)

electrical to thermal

d)

electrical to sound

75.

What type of energy transformation happens in hydro-electric power?

a)

kinetic to potential

b)

sound to mechanical

c)

chemical to electrical

d)

mechanical to electrical

76.

What type of energy is stored in batteries or food?

a)

Potential energy

b)

Thermal energy

c)

Chemical energy

d)

Mechanical energy

77.
a battery will convert _______ energy into electrical energy
a)
chemical energy
b)
nuclear energy
c)
mechanical energy
d)
light energy
78.
when a battery is used electrons move
a)
from the anode to the cathode
b)
from the cathode to the anode
c)
nowhere
79.

What are the three basic parts of a cell

a)

Anode, load, depolarizer

b)

Electrodes, electrolyte, container

c)

Electrodes, acid, water

d)

Anode, cathode, ions

80.

In a dry cell, what is the consistency of the electrolyte?

a)

Paste

b)

Solid

c)

Powder

d)

Liquid

81.

An example of a secondary cell is:

a)

A button cell

b)

An alkaline cell

c)

A fuel cell

d)

A car battery

82.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
83.
What happens to the strength of an electromagnet as you add more coils around it?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Stops completely
84.

What can you do to make electromagnets stronger?

a)

Increase number of coils of wire.

b)

Increase number of batteries used.

c)

Both A and B.

d)

Neither A nor B.

85.

What is produced by moving a permanent magnet through a coil of copper wire?

a)

electricity

b)

electromagnet

c)

light

d)

sound

86.
Electric motors are devices that convert _____ energy into  _____ energy.
a)
electrical; mechanical
b)
mechanical; electrical
c)
chemical; potential
d)
mechanical; kinetic
87.
In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.
a)
Wind
b)
Water
c)
Magnets
d)
Circuits
88.
This picture shows a turbine generator used to produce electricity at a geothermal power plant.
Electricity is produced by using steam to _____________.
a)
heat the turbine generators
b)
spin the turbine generators 
c)
reduce friction in the turbine generators
d)
reduce emissions from the turbine generators
89.

Which of the following allows the current in the roto coils to change directions every half turn?

a)

Powersupply

b)

field magnets

c)

commutator

d)

armature

90.

Which of the following is spun due to the interactions between the magnetic fields?

a)

powersupply

b)

field magnets

c)

commutator

d)

armature

91.

Which ONE of the energy conversions below takes place when a DC motor is in operation?

a)

Kinetic to electrical

b)

Heat to mechanical

c)

Mechanical to electrical

d)

Electrical to mechanical

92.

In a DC generator the current to the external circuit is delivered through the …

a)

coils.

b)

battery.

c)

slip rings.

d)

split rings (commutators).

93.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
94.

What is the transfer of energy in when you plug in a motor and it spins?

a)

chemical to mechanical

b)

electrical to mechanical

c)

mechanical to electrical

d)

physical to potential

95.

Which best describes how a motor works?

a)

When a fan blows on a wire, it causes it to spin, creating a force.

b)

When a fan blows on a wire, it causes it to spin, creating an electrical current.

c)

When a wire that carries electrical current is placed in zero gravity, the wire experiences a force.

d)

When a wire that carries electrical current is placed in a magnetic field, the wire experiences a force.

96.

What type of transformer is a location B?

a)

step up

b)

step down

97.

What type of transformer is a location D?

a)

step up

b)

step down

98.

What type of transformer is A?

a)

Step up

b)

Step down

99.

What type of transformer is D?

a)

Step up

b)

Step down

100.
Which of these is NOT a part of a DC Generator.
a)
Slip rings
b)
commutator 
c)
brushes
d)
stator
101.

Look at the picture what is letter A?

a)

Armature

b)

Commutator

c)

Permanent Magnet

d)

DC Source

e)

AC Source

102.

Look at the picture what is letter B?

a)

Armature

b)

Commutator

c)

Permanent Magnet

d)

DC Source

e)

AC Source

103.

Look at the picture what is letter C?

a)

Armature

b)

Commutator

c)

Permanent Magnet

d)

DC Source

e)

Brush

104.

Look at the picture what is letter D?

a)

Armature

b)

Commutator

c)

Permanent Magnet

d)

DC Source

e)

Brush

105.

a)

A

b)

B

c)

C

d)

D

106.
How do you increase the strength of an electromagnet?
a)
Decrease the number of batteries and increase the number of coils
b)
Increase the electric current and decrease the batteries
c)
You cannot strengthen an electromagnet
d)
Increase the electric current and increase the number of coils
107.
What is created when a magnet moves through a coil of wire?
a)
An electric current
b)
An electromagnet
c)
A solenoid
d)
A ferromagnet
108.

Mains electricity is...

a)

an alternating current (a.c.) supply

b)

a direct current (d.c.) supply

c)

a variable current (v.c) supply

d)

a continuous current (c.c) supply

109.

the unit of power is the...

a)

Watt

b)

Joule

c)

Ohm

d)

Newton

110.

calculate the power of a kettle that has a potential difference of 230 V and a current 10 A.

Don't include commas or spaces in your answer

(a)  

111.

A device that changes linear motion into circular motion.

a)

Turbine

b)

Generator

c)

Transformer

d)

Smart Meter

112.

A device that changes voltage.

a)

Turbine

b)

Generator

c)

Transformer

d)

Smart Meter

113.

An oscilloscope shows the current flow above what type of current is it showing?

a)

DC

b)

AC

c)

Rectified Current

d)

Non rectified current

114.
a)

DC

b)

AC

c)

rectified current

d)

non rectified current

115.
If the hair dryer and the vacuum cleaner are both on, what is the power used?
a)
2600 watts
b)
400 watts
c)
2200 watts
d)
1100 watts
116.
A heating element resistance is 24 ohms. The current measures 10 Amps. What is the power?
a)
240 watts
b)
1,200 watts
c)
1,000 watts
d)
2,400 watts
117.
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
118.
What voltage is needed to cause a 2A current flow through a 10Ω resistor?
a)
5V
b)
0.2V
c)
20V
d)
200V
119.
What voltage is needed to cause a 5A current flow through a 2Ω resistor?
a)
10V
b)
2.5V
c)
7V
d)
0.4V
120.

Calculate the power rating of an electric toaster that uses 210 000 J while toasting bread for 140 s

a)

1500 J

b)

1200 W

c)

1500 W

d)

1300 J

121.

Calculate the percent efficiency of an electric motor that uses 15 000 J of energy to produce

11 500 J of useful movement.

a)

76.6%

b)

82.3%

c)

75.4%

d)

23.3%

122.

Calculate the energy used by a coffee maker that has a power rating of 0.900 kW and operated for 17 hours.

a)

15.3 kwh

b)

17.3 kwh

c)

900 kwh

d)

1200 kw

123.

Calculate the cost of operating a heater of 1.75kw for 20 hours at rate of $0.13 per kwh?

a)

$6.75

b)

$4.55

c)

$53.43

d)

$45.53

124.

The units for Power are

a)

Joules

b)

Joules/sec

c)

watts

d)

amps

125.

If a 13w bulb is left on for 30 minutes, how much energy is used?

a)

390 J

b)

1800 J

c)

23,400 J

d)

1,404,000 J

126.

A Keurig machine draws 5 A. The voltage of the outlet is 120 V. How much power is required?

a)

600 w

b)

300 w

c)

24 w

d)

5 w

127.

A 50w flood light is used outside. How long does it need to be on to use 100,000 J of energy?

a)

5,000,000 s

b)

5,000 s

c)

2,000 s

d)

200 s

128.

How much current does a laptop draw if it is rated at 360 w? A household circuit provides 120V.

a)

43,000 A

b)

120 A

c)

30 A

d)

3 A

129.

A garage door opener draws 10 A. If it is on for 15 seconds, how much energy does it use? The voltage provided is 120 V. Hint: This may require two calculations!

a)

1.25 J

b)

12 J

c)

80 J

d)

18,000 J

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