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


1.

There is a potential difference of 12 V across a resistor with 0.25 A of current
in it. The resistance of the resistor is
a.  48 W.  c.  12 W.  b.  24 W.  d.  0.021 W. 


2.

A resistor has a resistance of 280 W. How much
current is in the resistor if there is a potential difference of 120 V across the resistor?
a.  160 A  c.  0.12 A  b.  0.43 A  d.  2.3 A 


3.

If a lamp is measured to have a resistance of 120 W
when it operates at a power of 1.00 ´ 10^{2} W, what is the
potential difference across the lamp?
a.  110 V  c.  0.913 V  b.  120 V  d.  220 V 


4.

A microwave draws 5.0 A when it is connected to a 120V outlet. If electrical
energy costs $0.090/kW • h, what is the cost of running the microwave for exactly 6
hours?
a.  $2.70  c.  $0.72  b.  $1.60  d.  $0.32 


5.

When there is an equal amount of positive and negative charges on an object, the
object is
a.  positively charged.  c.  neutral.  b.  negatively charged.  d.  supercharged. 


6.

The electric force between charged objects is
a.  attractive only.  c.  either attractive or repulsive.  b.  repulsive
only.  d.  neither attractive
nor repulsive. 


7.

Every charged particle produces a(n)
a.  negative charge.  c.  magnetic field.  b.  positive charge.  d.  electric field. 


8.

When compared to a –2 charge, there are
a.  an equal number of field lines pointing inward toward a +4
charge.  b.  twice as many field lines pointing inward toward a +4 charge.  c.  twice as many field
lines pointing outward from a +4 charge.  d.  half as many field lines pointing outward from
a +4 charge. 


9.

Potential difference is measured in
a.  amperes.  c.  coulombs.  b.  volts.  d.  joules. 


10.

Current is the rate at which charges move through a(n)
a.  conductor.  c.  voltage.  b.  insulator.  d.  joule. 


11.

A flashlight bulb with a potential difference of 4.5 V across its filament has a
power output of 8.0 W. How much current is in the bulb filament?
a.  3.7 A  c.  0.23 A  b.  1.8 A  d.  0.56 A 


12.

A 13W resistor has 0.050 A of current in it. What is
the potential difference across the resistor?
a.  6.5 V  c.  0.065 V  b.  0.65 V  d.  0.0065 V 


13.

A set of electric trains are powered by a 9V battery. What is the resistance of
the trains if they draw 3.0 A of current?
a.  3 W  c.  27 W  b.  0.03 W  d.  2.7
W 


14.

An electric toaster has a power rating of 1,100 W at 110 V. What is the
resistance of the heating coil?
a.  7.5 W  c.  10 W  b.  9.0 W  d.  11
W 


15.

A color television draws about 2.5 A when it is connected to a 120V outlet.
Assuming electrical energy costs $0.060 per kW • h, what is the cost of running the television
for exactly 8 hours?
a.  $1.44  c.  $0.14  b.  $0.03  d.  $0.30 


16.

A device that protects a circuit from current overload is called a
a.  resistor.  c.  circuit breaker.  b.  capacitor.  d.  closed circuit. 


17.

What happens to the resistance of a superconductor when its temperature drops
below the critical temperature?
a.  Resistance increases.  c.  Resistance drops to zero.  b.  Resistance
doubles.  d.  Resistance is
reduced by one half. 


18.

What happens to the overall resistance of a circuit when too many appliances are
connected across a 120V outlet?
a.  Resistance is increased.  c.  Resistance is
decreased.  b.  Resistance stays the same.  d.  Resistance is zero. 

Matching



Match each item to the correct statement below. a.  a material that allows electric charges to move easily  b.  SI unit of electric
charge  c.  alignment of charges at the surface of an object producing an induced
charge  d.  the force of attraction or repulsion between objects due to
charge  e.  a material that does not easily transfer electric charge  f.  an electrical
property of matter that creates electric and magnetic forces and
interactions 


19.

electrical insulator


20.

electrical conductor


21.

electric force


22.

polarization


23.

coulomb


24.

electric charge



Match each item to the correct statement below. a.  a circuit in which two or more paths are connected to the voltage
source  b.  a device that contains a metal strip that melts when a certain current is
exceeded  c.  a lowresistance alternative pathway for current to travel in a
circuit  d.  a device used to open or close an electric circuit  e.  a circuit in which
the components form a single path  f.  the rate at which electrical work is
done 


25.

switch


26.

series circuit


27.

parallel circuit


28.

electric power


29.

fuse


30.

short circuit
