Multiple Choice Identify the choice that best completes the
statement or answers the question.


1

When a 15V battery is connected to a resistor, 2 A of current flows in the
resistor. What is the resistor's value?
a.  30 ohms  b.  2 ohms  c.  7.5 ohms
 d.  15 ohms  e.  more than 30
ohms 


2

A light bulb is plugged into a 120volt outlet and has a 0.3 A current in it.
What is the power rating of the light bulb?
a.  120 W  b.  40 W  c.  400
W  d.  36 W  e.  12 W 


3

Alternating current is made by
a.  alternating current and voltage.  b.  alternating the direction of voltage of the
power source.  c.  huge chemical batteries.  d.  none of the
above 


4

The frequency of AC current in North America is
a.  60 hertz.  b.  50 hertz.  c.  30
V.  d.  120 V. 


5

Current from a battery is always


6

What is the SI unit for electrical potential energy?
a.  volts  b.  coulombs  c.  watts  d.  joules 


7

Electric power is defined as
a.  current times resistance.  b.  resistance times voltage.  c.  current times
voltage.  d.  voltage divided by current.  e.  current divided by
voltage. 


8

What affect would tripling the resistance in
a circuit have on the current.
a.  decrease it by a factor of six  c.  increase it by a factor of three  b.  decrease it by a factor of three  d.  increase it by a
factor of six 


9

How much power is used by a 6.0V flashlight battery that draws 1.5 A of
current?
a.  30 W  b.  6 W  c.  4
W  d.  1.5 W  e.  9 W 


10

In order for there to be a flow of charge from one place to another, there must
be a
a.  conductor, such as a wire, connecting the two places.  b.  potential difference
between the two places.  c.  Both A and B
above 


11

A 60W light bulb and a 100W light bulb are each connected to a 120V outlet.
Which light bulb has more current in it?
a.  the 100W bulb.  b.  The same amount of current flows in
both.  c.  the 60W bulb. 


12

Any path along which electrons can flow is called a
__________.
a.  potentiometer  c.  electrical pathway  b.  electrical
circuit  d.  wire 


13

Electric potential is defined as
a.  electrical potential energy.  b.  electrical potential energy of a charge divided
by the quantity of the charge.  c.  voltage.  d.  electrical potential
energy of a charge multiplied by the quantity of the charge.  e.  gravitational
potential. 


14

If you plug an electric toaster rated at 110 V into a 220V outlet, current in
the toaster will be
a.  the same as if it were plugged into 110 V.  b.  more than twice what
it should be.  c.  twice what it should be.  d.  half what it should be.  e.  none of the
above 


15

An ampere is a
a.  unit of current.  b.  current.  c.  type of
charge.  d.  voltage.  e.  unit of
resistance. 


16

While you are standing on the ground in your running shoes, the greatest
resistance between you and the ground is in
a.  the running shoes.  b.  the clothes you are
wearing.  c.  your skin.  d.  your muscles.  e.  your
legs. 


17

When connected to a 110volt power supply, how much current is in a light bulb
that has a resistance of 330 ohms?
a.  330 A  b.  0.3 A  c.  110
A  d.  36,300 A  e.  3.0 A 


18

Power outlets in our homes typically have a potential difference of
a.  240 V.  b.  120 A.  c.  30
V.  d.  60 A.  e.  120 V. 


19

For most conductors, as their temperature increases, their resistance
a.  increases.  b.  decreases.  c.  stays the
same. 


20

A 10ohm resistor has a 3A current in it. What is the voltage across the
resistor?
a.  3 V  b.  18 V  c.  13
V  d.  10 V  e.  more than 18 V 


21

A 20ohm resistor has a 5A current in it. What is the voltage across the
resistor?
a.  5 V  b.  20 V  c.  30
V  d.  25 V  e.  more than 30 V 


22

The current through a 5ohm resistor connected to a 150V power supply is
a.  10 A.  b.  30 A.  c.  150
A.  d.  1A.  e.  none of the
above 


23

When a 10V battery is connected to a resistor, 2 A of current flows in the
resistor. What is the resistor's value?
a.  20 ohms  b.  5 ohms  c.  2 ohms
 d.  10 ohms  e.  more than 20
ohms 


24

Touching a charged body to earth to eliminate
excess charge is called __________.
a.  charging  c.  equalizing  b.  grounding  d.  static
equilibrium 


25

In circuits of metal wires, _____________ are the
flowing charged particles.
a.  electrons  c.  neutrons  b.  protons  d.  protons or
electrons 


26

What affect would tripling the voltage in a
circuit have on the current.
a.  decrease it by a third  c.  triple it  b.  increase it by a
factor of 6  d.  no effect 


27

When an 8V battery is connected to a resistor, 2 A of current flows in the
resistor. What is the resistor's value?
a.  4 ohms  b.  8 ohms  c.  2 ohms
 d.  16 ohms  e.  more than 16
ohms 


28

Electrical resistance in a wire depends on the wire's
a.  thickness.  b.  length.  c.  conductivity.  d.  all of the above  e.  none of the
above 


29

Compared to thin wires, electrical resistance in thick wires is
a.  less.  b.  the same.  c.  greater. 


30

When plugged into a 120V wall outlet, how much current is used by a lightbulb
rated at 100 W?
a.  100 A  b.  0.8 A  c.  12,000
A  d.  120 A  e.  none of the
above 


31

If you accidentally grabbed the prongs of a partially pluggedin 120V
electrical plug on a day when your skin resistance was 140,000 ohms, how much current would pass
through your body?
a.  1,167 A  b.  16,800,000 A  c.  140,000
A  d.  120 A  e.  0.0009 A 


32

Materials through which charges do
not move easily. (e.g. glass, dry wood, most plastics, cloth, and dry air) are called
_____________.
a.  insulators  c.  ionic
compounds  b.  circuits  d.  conductors 


33

Electrical resistance is measured in
a.  watts.  b.  amperes.  c.  joules.  d.  volts.  e.  none of the
above 


34

In solid conductors, electric current is the flow of
a.  protons.  b.  negative ions.  c.  positive and
negative charges.  d.  electrons.  e.  none of the
above 


35

An example of a voltage source is
a.  a car battery.  b.  a generator.  c.  a dry
cell.  d.  rubbing a rubber rod with fur.  e.  all of the
above 


36

Materials that allow charges to move about easily
(e.g. metals, plasma (ionized gas), graphite) are called _____________.
a.  circuits  c.  conductors  b.  insulators  d.  ionic compounds 


37

What is the SI unit for charge?
a.  volt  b.  watt  c.  coulomb  d.  joule 


38

The rate at which energy is
transferred is called ____________.
a.  work  c.  energy  b.  current  d.  power 


39

What is the resistance of a toaster that uses 3 A of current when connected to a
120volt power source?
a.  360 ohms  b.  120 ohms  c.  40
ohms  d.  3 ohms  e.  none of the
above 


40

A volt is a unit of
a.  charge.  b.  current.  c.  electric
potential.  d.  work.  e.  energy. 
