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Unit 4 Electricity Review

Total questions: 91

Worksheet time: 2hrs 9mins

Name
Class
Date
1.
At which point is the electric field the strongest
a)
A
b)
B
c)
C
d)
D
2.
Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.
a)
+,+
b)
+,-
c)
-,+
d)
-,-
3.

What kind of charge is this?

a)

Positive charge

b)

Negative charge

c)

Neutral charge

4.

What kind of charge is this?

a)

Positive charge

b)

Negative charge

c)

Neutral charge

5.

How will these charges interact?

a)

Repel

b)

Attract

c)

No interaction

6.

How will these charges interact?

a)

Repel

b)

Attract

c)

No interaction

7.

How will these charges interact?

a)

Repel

b)

Attract

c)

No interaction

8.

Repel means

a)

To pull toward each other.

b)

To push away from each other.

c)

Neither positive nor negative.

d)

Either a negative (-) or positive (+) charge.

9.

Attract means

a)

To pull toward each other.

b)

Either a negative (-) or positive (+) charge.

c)

To push away from each other.

d)

Neither positive nor negative.

10.

Which sign is associated with a positive charge?

a)

-

b)

+

c)

=

d)

$

11.

Which sign is associated with a negative charge?

a)

=

b)

+

c)

-

d)

$

12.

What is the net charge of the balloon in the picture?

a)

-1

b)

+1

c)

-2

d)

0

13.

What is the net charge of the balloon?

a)

-1

b)

+1

c)

0

d)

+2

14.

How will the two balloons interact?

a)

Attract

b)

Repel

c)

No interaction

15.

How will the two balloons interact?

a)

Attract

b)

Repel

c)

No interaction

16.

The area around an electric charge that experiences the force exerted by the electric

charge.

a)

Electric Field

b)

Electric Force

c)

Electric Poles

d)

Electric charge

17.

the negative charges in the blue circle will .......the positive charges in the red circle

a)

repel

b)

attract

c)

nothing happens

18.

in a............electrical charges can move easily

a)

insulator

b)

conductor

c)

nothing

19.

in an...........electrical charges cannot move easily

a)

conductor

b)

insulator

c)

nothing

20.

A repelling force occurs between two charged objects when the charges of are of __________.

a)

like signs

b)

unlike signs

c)

equal magnitude

d)

unequal magnitude

21.

An attracting force occurs between two charged objects when the charges are of _______________.

a)

like signs

b)

unlike signs

c)

equal magnitude

d)

unequal magnitude

22.

What happens when a neutral material becomes attracted to a negatively charged object that is brought near it?

a)

It doesn't become attracted.

b)

The charges in the neutral object move around because of the nearby charged object.

c)

The neutral material will repel the negatively charged object.

d)

The neutral material loses some of it's positive charges.

23.

The ___________ _____________ is the force of attraction or repulsion between objects due to their charges.

a)

electric charge

b)

electric force

c)

distance

d)

variable

24.

What is the effect of an electric field surrounding every charged object.

a)

Electrons move from one object to another.

b)

Electric force is applied to other charged objects.

c)

An unbalanced charge forms on the object.

d)

A flash of light, called lightning, occurs.

25.

What is the effect of electrons moving from one object to another.

a)

Electrons move from one object to another.

b)

Electric force is applied to other charged objects.

c)

An unbalanced charge forms on the object.

d)

A flash of light, called lightning, occurs.

26.

An electric field causes any charged particle in it to experience an electric force.

a)

True

b)

False

27.

According to Coulomb's Law, The greater the separation distance between two charges the greater the magnitude of the electric force. True or False?

a)

True

b)

False

28.

A balloon has a negative charge. A glass rod has a positive charge. What will happen when the rod is brought near the balloon?

a)

the balloon will be attracted to the rod

b)

the balloon will remain in place

c)

the balloon will be repelled by the rod

d)

the balloon will spin in circles

29.

Two charges are near each other. The magnitude of both charges is doubled. By what factor will the Coulomb force change?

a)

2

b)

4

c)

1/2

d)

1/4

30.

If the distance between two charges triples, by what factor will the force between them change?

a)

3

b)

9

c)

1/3

d)

1/9

31.
Two oppositely charged particles are held in place near each other. When the particles are released, what will most likely happen?
a)
they will accelerate towards each other
b)
they will accelerate away from each other
c)
they will move towards each other at a constant speed
d)
they will move away from each other at a constant speed
32.

Two small hollow metal spheres hung on insulating threads attract one another as shown. It is known that a positively charged rod will attract sphere A. Which statements can be correctly concluded about the charge on the spheres?

a)

A has a positive charge

b)

B has a negative charge

c)

A and B have opposite charges

d)

A is neutral

33.

If the distance between two positive charges increases by a factor of 2, what happens to the force between those charges?

a)

It decreases by a factor of 2.

b)

It does not change.

c)

It increases by a factor of 4.

d)

It decreases by a factor of 4.

34.

The electric field lines for a positive charge is always directed away from the charge. True or False?

a)

True

b)

False

35.
If a negatively charged rod touches a conductor, the conductor will be charged by what method? 
a)
Friction
b)
Conduction
c)
Induction
d)
Convection
36.

The coulomb is the unit for:

a)

electric charge

b)

electric force

c)

distance

d)

electric potential

e)

electric power

37.

A body can be negatively charged by

a)

Giving excess of electrons to it

b)

Removing some neutrons from it

c)

Removing some electrons from it

d)

Giving some protons to it

38.

Which of the equations below is the Coulomb's law?

a)
b)
c)
d)
39.

A potential difference of 24 V is applied to a 150 resistor. How much current flows through the resistor?

a)

0.15 A

b)

3600 A

c)

6.25 A

d)

0.16 A

40.

What is a current?

a)

A rate of charges flow through a cross-sectional area of a wire

b)

A closed path that a current can flow along

41.

The amount of energy used to move one coulomb of electrons through the circuit is its

a)

current

b)

voltage

c)

resistance

42.

An electric current that continually reverses direction over time is known as a(n)

a)

direct current

b)

alternating current

c)

simple current

43.

An electric current that has constant magnitude and direction over time is known as a(n)

a)

direct current

b)

alternating current

c)

simple current

44.
Current is...
a)
moving protons
b)
moving electrons
c)
measured in volts
d)
measured in ohms
45.
Resistance is...
a)
What "slows down" electrons
b)
What "speeds up" electrons
c)
Moving electrons
d)
What "pushes" electrons
46.
If the voltage stays the same, but the resistance goes up, the current will....
a)
increase (speed up)
b)
decrease (slow down)
c)
stay the same
47.
A light bulb is an example of a _______.
a)
current
b)
resistor
c)
battery
48.

A potential difference of 24 V is applied to a 150 resistor. How much current flows through the resistor?

a)

0.15 A

b)

3600 A

c)

6.25 A

d)

0.16 A

49.

This is an example of a _______ circuit

a)

open

b)

series

c)

parallel

d)

square

50.

This is an example of a ______ circuit

a)

Series

b)

Parallel

c)

Open

d)

Dihexihedral

51.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
52.
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
53.
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)
192 Amps
c)
2 Amps
d)
4 Amps
54.
This is an example of a ______ circuit
a)
Series
b)
Parallel
c)
Open
d)
Dihexihedral
55.
The total resistance in this circuit is 
a)
100 ohms
b)
450 ohms
c)
400 ohms
d)
30 ohms
56.
The total current through this circuit is
a)
0.02 amps
b)
0.09 amps
c)
50 amps
d)
9 amps
57.
The voltage dropped across the 300 ohm resistor is 
a)
6 V
b)
9 V
c)
2 V
d)
30 V
58.
As resistors are added in series to a circuit, the total resistance will...
a)
increase
b)
decrease
c)
stay the same
59.
As the resistance of a circuit increases, the current will...
a)
increase
b)
decrease
c)
stay the same
60.
In a parallel circuit which of the following is the same value throughout the circuit?
a)
Voltage
b)
Current
c)
Resistance
d)
Charge
61.
The current going through the 45 ohm resistor is 
a)
0.05 amps
b)
0.2 amps
c)
0.1 amps
d)
5 amps
62.
The total resistance of this circuit is 
a)
25.7 ohms
b)
315 ohms
c)
324 ohms
d)
90 ohms
63.
The total current going through the battery of this circuit is
a)
0.35 amps
b)
0.0286 amps
c)
0 amps
d)
9 amps
64.
A series circuit has how many pathways for the electrons to flow?
a)
Two
b)
One
c)
Many
d)
Zero
65.
What is one problem with using a series circuit? 
a)
It has a lot of series. 
b)
If one light goes down, they all go down! 
c)
It doesn't work properly.
d)
There are no problems. 
66.
What is a benefit of using a parallel circuit?  
a)
It gets confusing.
b)
There are no problems.
c)
If one light goes out, it does not affect the others. 
d)
If one light goes out, they all go out. 
67.
A lamp changes __________ energy into light energy.
a)
Kinetic
b)
Electrical
c)
Sound
d)
Chemical
68.

What is the unit of electrical power?

a)

watt, W

b)

volt, V

c)

ampere, A

d)

ohm, Ω

69.
A current of 4 A flows through a 20 V car headlight bulb. Calculate the electric power.
 
Remember: I=P/V
a)

80 W

b)

200 W

c)

2.5 A

d)

4.55 A

70.
Calculate the electric power of an electrical appliance of 20 V having a resistance of 10 ohms.
 
Remember: I=V/R and P=VI
a)

200 W

b)

40 W

c)

2.5 A

d)

79.20 KJ

71.
When you charge a balloon by rubbing it on your hair this is an example of what method of charging?
a)
Friction
b)
Conduction
c)
Grounding
d)
Induction
72.
Which of these is the best definition of polarization?
a)
The object gains a positive or negative charge from another object.
b)
The charges in a neutral object separate due to a nearby charged object.
c)
Charges on a neutral object jump off onto a charged object due to attraction of opposite charges.
d)
Two objects attract each other because they are both charged.
73.

When you take your clothes out from the dryer, sometimes there is static electricity on the clothes. This is caused by:

a)

Induction

b)

Conduction

c)

Friction

d)

None of the above

74.

What is this symbol?

a)

Cell

b)

Switch

c)

Bulb

d)

Resistor

75.

What is this symbol?

a)

Switch

b)

Fuse

c)

Bulb

d)

Resistor

76.

What is this symbol?

a)

Switch

b)

Fuse

c)

Bulb

d)

2 cell battery

77.

This switch is open.

a)

True

b)

False

78.

If the switch is open in a circuit, then...

a)

...electricity will flow.

b)

....electricity will NOT flow.

79.

What is the unit of Electrical Power?

a)

Joule

b)

Watt

c)

Where

d)

Amp

80.

The unit of energy is?

a)

Amp

b)

Joule

c)

kiloWatt

d)

Volt

81.

A kilowatt (kW) is how many watts?

a)

10

b)

50

c)

100

d)

1000

82.

Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps

a)

300 volts

b)

30 volts

c)

12 volts

d)

0.08 volts

83.
What is the power of a 20V bulb with 5A through it?
a)
100W
b)
100V
c)
6.3W
d)
6.3A
84.
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
85.
Electrical power can be calculated using
a)
Resistance x Voltage
b)
Voltage x Current 
c)
Voltage ÷ Current
86.

Coffee Pot @

120 V What is the amperage?

a)

10 Amps

b)

12 Amps

c)

10 Watts

d)

12 Ohms

87.
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
88.

What is the power of a circuit that has 2 ohms of resistance with a current of 2.6 A?

a)

13.52 watts

b)

5.2 watts

c)

3.38 watts

d)

0.296 watts

89.

What is the total resistance in the circuit if there are 6 A flowing through with a power of 100 watts

a)

16.67 ohms

b)

2.78 ohms

c)

600 ohms

d)

1667 ohms

90.

If the power in a circuit is 60 watts, and the resistance is 13 ohms, what is the voltage?

a)

27.93 volts

b)

780 volts

c)

0.355 volts

d)

16.64 volts

91.

What is the power of a circuit that has a battery of 13 volts with a resistance of 3.5 ohms?

a)

48.28 watts

b)

1.06 watts

c)

3.714 watts

d)

1.93 watts

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