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problem solving in electricity

Total questions: 91

Worksheet time: 1hrs 25mins

Name
Class
Date
1.
What variable is a Coulomb the unit for?
a)
Charge
b)
Force
c)
Distance
d)
Mass
2.
What happens to the force between two charged objects if you double the distance between them and double the magnitude of one charge?
a)
4X
b)
6X
c)
1/2X
d)
1/6X
3.
When distance increases, electrostatic force ____________; we call this relationship ____________ proportional
a)
decreases;directly
b)
decreases;inversely
c)
increases;inversely
d)
increases;directly
4.

Recap:

Coulomb’s law states that the force between two charged objects will __________ when the magnitude of the object’s charge increases.

Coulomb’s law also states that the force between two charged objects will __________ when the distance between objects increases.

a)

increase; increase

b)

increase; decrease

c)

decrease; increase

d)

decrease; decrease

5.
The plastic covering is there to:
a)
Provide a conductor for electrical energy to flow.
b)
Provide an insulator so that electrical energy will not pass outside of the wires.
c)
Provide a conductor so that electrical energy can NOT flow.
d)
Provide an insulator so that electrical energy can flow.
6.

The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the magnitude of charge on q2 doubles?

a)

9.6 N

b)

4.8 N

c)

1.2 N

d)

.6 N

7.

The image shows two charged particles with a force of 2.4 N. What would you predict the force of interaction would be when the distance doubles?

a)

4.8 N

b)

1.2 N

c)

.6 N

d)

.3 N

8.
The Electric Force is strongest when charges are...
a)
close together
b)
far apart
c)
the electric force is constant everywhere
9.
As a proton moves in the direction the electric field lines...
a)
it is moving from low potential to high potential and gaining electric potential energy.
b)
it is moving from low potential to high potential and losing electric potential energy.
c)
it is moving from high potential to low potential and gaining electric potential energy.
d)
it is moving from high potential to low potential and losing electric potential energy.
10.

Electric potential ____________ as distance increases.

a)

Increases

b)

Decreases

c)

Remains Constant

d)

Is 0

11.

The SI unit for electric potential is the ___________.

a)

Volen

b)

Vespa

c)

Volt

d)

Valspar

12.
What is voltage?
a)
The amount of electric potential energy per one coulomb of charge
b)
The amount of 1 coulomb of charge per unit of potential energy
c)
The number of volts per coulomb
d)
The amount of electric potential energy per volt
13.
QA and QB are two charges creating an electric field. Based on the electric field lines, we can conclude
a)
QA and QB are both positive
b)
QA and QB are both negative
c)
QA is positive and QB is negative
d)
QA is negative and QB is positive
14.

Every proton in the universe is surrounded by its own

a)

gravitational field

b)

electric field

c)

both gravitational and electric field

d)

none of the above

15.

The direction of electric field lines shows the

a)

direction of the force on a test positive charge.

b)

size of the field.

c)

strength of the field.

d)

all of the above

16.
A tiny sphere carrying a charge of 6.5 µC sits in an electric field, at a point where the electric potential is 240 V. What is the sphere’s potential energy?
a)
2.7 x 10-8 J 
b)
6.5 x 10-6 J 
c)
1.6 x 10-3 J
d)
240 J 
17.
If 500 J of work are required to carry a 40-C charge from one point to another, the potential difference between these two points is: 
a)
12.5 V 
b)
20,000 V 
c)
0.08 V 
d)
depends on the path 
18.
The potential difference between two points is 100 V. If a particle with a charge of 2 C is transported from one of these points to the other, the magnitude of the work done is: 
a)
200 J
b)
100 J
c)
50 J
d)
2 J
19.
During a lightning discharge, 30 C of charge move through a potential difference of 1.0 x 108 V in 2.0 x 10–2 s. The energy released by this lightning bolt is: 
a)
1.5 ´ 1011 J
b)
3.0 ´ 109 J 
c)
6.0 ´ 107 J 
d)
3.3 ´ 106 J
20.

Two plates are 2cm apart, a potential difference of 10 V is applied between them, the electric field between the plates is

a)

20 N/C

b)

500 N/C

c)

5 N/C

d)

250 N/C

21.

Electric potential energy is greatest at point...

a)

A

b)

B

22.

Electric potential (voltage) is greatest at point...

a)

A

b)

B

23.

Moving an electron within an electric field would change the ____ the electron.

a)

mass of

b)

amount of charge on

c)

potential energy of

24.

Which of the following is true about the electrical circuit in your flashlight?

a)

Charge moves around the circuit very fast - nearly as fast as the speed of light.

b)

... nonsense! None of these are true.

c)

The battery supplies the charge (protons) that moves through the wires.

d)

The charge becomes used up as it passes through the light bulb.

e)

The battery supplies energy that raises charge from low to high voltage.

25.

Solve for the total resistance of the circuit shown

a)

50 V

b)

1970 ohms

c)

705 K ohms

d)

20 Amps

26.

Solve for total Current in the circuit shown

a)

25 Amps

b)

35 amps

c)

25 milliamps

d)

35 milliamps

27.

Solve for the current flowing through Resistor # 1

a)

35 amps

b)

25 amps

c)

35 milliamps

d)

25 milliamps

28.

Solve for the voltage drop at resistor 1

a)

38 volts

b)

60 Kvolts

c)

50 volts

d)

25 volts

29.

Voltage drop stands for what?

a)

the voltage applied to a circuit

b)

the voltage flowing through a resistor

c)

the voltage used by a load

30.

With three 10 resistors connected in series with a 30 volt power supply, the total circuit current will equal ____.

a)

300 amps

b)

1 amp

c)

150 amps

d)

1 millamp

31.

Total series circuit wattage is equal to source voltage ____.

a)

multiplied by the voltage value going through any resistor

b)

multiplied by the current value going through any resistor

c)

divided by the current value going through any resistor

d)

divided by the voltage applied to the circuit and the total resistance of the circuit

32.

Using the circuit shown solve for total power dissipated in this circuit.

a)

20 watts

b)

30 watts

c)

1.8 Kilowatts

d)

180 watts

33.

When a resistor in a series circuit is replaced by another resistor with an increased resistance value, the total circuit current will __________.

a)

stay the same

b)

decrease

c)

increase

d)

double in value

34.

What is the total circuit resistance of the following five resistors connected in series?

R1 = 27 ohms

R2 = 33 ohms

R3 = 51 ohms

R4 = 1.2 kohms

R5 = 240 ohms

Rt = __________ Ohms

a)

353.2

b)

1551

c)

1.9 K

35.
Resistance is...
a)
What "slows down" electrons
b)
What "speeds up" electrons
c)
Moving electrons
d)
What "pushes" electrons
36.
What characteristics impact resistance of a material?
a)
Thickness 
b)
Temperature
c)
Length
d)
All of these
37.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
38.
What does power mean?
a)
Joules transferred per second
b)
Electron flow per second
c)
Speed of electrons
d)
Electron energy
39.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
40.
What is the unit of power?
a)

Ohms

b)
Volts
c)
Amps
d)

Watts

41.
What voltage is needed to produce 2A of current through a 10Ω resistor?
a)
20V
b)
0.2V
c)
5V
d)
2V
42.
What is Resistance?
a)
the degree to which a circuit component opposes the passage of an electric current, causing energy dissipation
b)
How hard the energy is pushed
c)
The amount of charges that pass by a given point per second
d)
None of the above
43.

What is the equivalent or total resistance (Re) across this circuit?

a)

3 kΩ

b)

10 kΩ

c)

13 kΩ

d)

18 kΩ

44.
How does resistance affect current?
a)
less resistance - less current
b)
more resistance - less current
c)
more resistance - more current
d)
resistance does not affect current
45.
The equivalent resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
46.

Which resistor has the biggest voltage across it?

a)

2 Ω

b)

3 Ω

c)

4 Ω

d)

all have the same

47.

What happens to resistance when the length of the wire increases?

a)

Stays the same

b)

Increases

c)

Decreases

48.

What effect does a hotter temperature have on resistance?

a)

No effect

b)

Increases resistance

c)

Decreases resistance

d)

Stays the same

49.

What other factor of a wire could affect its resistance?

a)

Material its made of

b)

How shiny it is

c)

Colour

50.
Calculate the electric power of an electrical appliance in which 10 A of current is flowing through a resistor of 2 ohms.
 
Remember: V=IR and P=VI
a)
80 W
b)
200 W
c)
2.5 A
d)
22.5 KJ
51.
What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?
Remember: I = P/V
a)
4.55 A
b)
28800 J or 28.8 KJ
c)
80 W
d)
200 W
52.
a pair of 15-watt computer speakers are connected to a 12-volt power supply. what is the electric current running through the speakers? 
a)
1.25 A
b)
0.8 A
c)
12.5 A
d)
180 A
53.
If an oven has a power of 2000 W and the voltage is 230 V what fuse is required?
a)
3A
b)
5A
c)
13A
54.
Stove @ 240 VAC
What is the amperage?
a)
16.67 Amps
b)
23.45 Amps
c)
43.33 Amps
d)
34.43 Amps
55.
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
56.

Look at the diagram. What is the term for "B"?

a)

Conductor

b)

Switch

c)

Transformer

d)

Source

57.

Look at the diagram. What is the term for "C"?

a)

Conductor

b)

Switch

c)

Transformer

d)

Source

58.

An example of an insulator of electricity is

a)

rubber

b)

copper

c)

silver

d)

iron

59.

Electricity from a power plant, solar conversion, and batteries are all examples of _____

a)

conductors

b)

insulators

c)

sources

d)

switches

60.

A circuit with the switch open allows

a)

electricity to flow so the switch is on

b)

electricity to NOT flow so the device is on

c)

electricity to flow so the device is off

d)

electricity to NOT flow so the device is off

61.

Every circuit needs AT LEAST which of the following

a)

source, conductor, transformer

b)

switch, conductor, transformer

c)

insulator, switch, source

d)

source, insulator, conductor

62.

A ____ circuit has more than one path available for electrons to flow through, so if one portion of the circuit is not functioning, the whole circuit does not shut down

a)

series

b)

parallel

c)

incomplete

d)

complete

63.

What is a device that contains a thin strip of metal that melts if there is too much current through it called?

a)

third prong

b)

circuit breaker

c)

fuse

d)

short circuit

64.

A current is electrically ______ when charges are able to flow directly into Earth.

a)

voltage source

b)

power

c)

series

d)

grounded

e)

static electricity

65.

You want to build a device that can conduct current, but that will be safe if touched by a person. Which of the following pairs of materials could you use?

a)

glass for the conductor and rubber for the insulator

b)

copper for the insulator and silver for the conductor

c)

sand for the conductor and plastic for the insulator

d)

plastic for the insulator and silver for the conductor

66.

What connects any metal pieces of an appliance to the ground wire of the building?

a)

third prong

b)

fuse

c)

circuit breaker

d)

short circuit

e)

grounded

67.

What is the term for a reusable safety switch that breaks the circuit when the current gets too high?

a)

third prong

b)

fuse

c)

circuit breaker

d)

short circuit

e)

grounded

68.

Without a fuse or circuit breaker, what might happen in a house with an overloaded electric circuit?

a)

the thin piece of metal would melt, breaking the circuit

b)

the metal band would heat up, disrupting the circuit

c)

a fire would start

d)

the electricity for the house would turn off

69.
Resistance in wire depends on how thick it is, how long it is and what it is made of.
a)
true
b)
false
70.

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

a)

create a spark

b)

melt

c)

sound an alarm

d)

do nothing

71.

Select the correct advantages of circuit breakers over fuses.

a)

Circuit breakers can be reset.

b)

Circuit breakers are cheaper.

c)

Circuit breakers stop the current faster.

72.

A current is electrically ______ when charges are able to flow directly into Earth.

a)

voltage source

b)

power

c)

series

d)

grounded

e)

static electricity

73.

What connects any metal pieces of an appliance to the ground wire of the building?

a)

third prong

b)

fuse

c)

circuit breaker

d)

short circuit

e)

grounded

74.

What is the term for a reusable safety switch that breaks the circuit when the current gets too high?

a)

third prong

b)

fuse

c)

circuit breaker

d)

short circuit

e)

grounded

75.

What is the term that means electric charges are able to flow directly from the circuit into Earth in the event of a short circuit?

a)

third prong

b)

fuse

c)

circuit breaker

d)

short circuit

e)

grounded

76.

Generally grounding is provided for

a)

safety of equipment only

b)

safety of human beings only

c)

safety of equipment & human beings

d)

none of above

77.

Fuse wire should possess

a)

High specific resistance and high melting point

b)

High specific resistance and low melting point

c)

Low specific resistance and low melting point

d)

Low specific resistance and high melting point

78.

Which of the following statements is NOT true about safety devices used at home?

a)

Safety devices are used to prevent electric shock.

b)

Safety devices cut the flow of current in case of overloading.

c)

Safety devices are used to provide alternative route for current in the case of a grounded circuit.

d)

Safety devices supply unsteady amount of voltage to protect appliances against overloading.

79.

The fuse at home has “blown” up many times. Which of the following must NOT be done to solve the problem and prevent it from happening again?

a)

Buy fuse with standard amperage rating.

b)

Do not use all appliances simultaneously.

c)

Call your barangay electrician to fix your electrical problem.

d)

Use jumper wire or cover the blown fuse with available silver paper.

80.

Which electrical device shuts down when there is overloading in the circuit?

a)

fuse

b)

voltage source

c)

circuit breaker

d)

electrical switch

81.

Which electrical device blows up when there is overloading in the circuit?

a)

fuse

b)

switch

c)

resistor

d)

circuit breaker

82.

Why is earthing used at home?

a)

To prevent short circuit

b)

To cut the circuit in case of overloading

c)

To reduce the resistance of the appliance

d)

To provide alternative route of upsurge current in case of grounded circuit.

83.

At home, you noticed that a portion of an electrical wire is worn out, exposing its metallic part. What do you think might happen if you will just ignore this problem?

a)

short circuit may happen

b)

circuit is of better condition

c)

overloading may not happen

d)

nothing happens when someone touches the wire

84.

What electrical circuit condition in which current returns and takes the path of metal casing of an appliance?

a)

short circuit

b)

series circuit

c)

parallel circuit

d)

grounded circuit

85.

Which of the following directs any excess current in the metal casing of appliances to the ground?

a)

fuse

b)

earthing

c)

circuit breaker

d)

electric sockets

86.

Which electrical connection involves plugging of several devices to an outlet or to an extension wire with multiple outlets?

a)

earthing

b)

single insulation

c)

double insulation

d)

octopus connection

87.

Which situations shows that current could go through the body?

a)

Direct contact with a grounded surface

b)

Direct contact with live parts of the installation

c)

Accidental contact with damaged wires that are seemingly not live

d)

All of the above

88.

What safety measure has been done by appliance manufacturers to prevent electric shock and grounded external casing of appliances?

a)

grounding

b)

using AVR

c)

double Insulation

d)

using circuit breaker

89.

The following are effects of alternating current in the body EXCEPT:

a)

It can lead to stronger muscles in the body.

b)

It can cause improper function of the brain and heart.

c)

Muscles will involuntarily contract which will be hard to control.

d)

The body will experience intense heat that can cause skin burning.

90.

How do you prevent from experiencing electric shock at home?

a)

Recycle blown up fuse

b)

Regularly check household wirings

c)

Plug electrical appliances with wet hand

d)

Continue using worn-out extension wire

91.

When do you consider repairing electrical wirings at home?

a)

when a newly bought extension cord is used

b)

when electrical appliances are in good condition

c)

when fuses blows out or circuit breakers trip off frequently

d)

when lights do not flicker even if other appliances are turned on

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