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INTRO TO ELECTRICITY

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

1. 
The strength of the electric force depends on the
a.
size of the objects.
c.
the distance between the charges.
b.
size of the charges.
d.
Both (b) and (c)
 

2. 
If two charges repel each other, the two charges must be
a.
positive and positive.
c.
negative and negative.
b.
positive and negative.
d.
Either (a) or (c)
 

3. 
A device that uses electrical energy to do work is called a
a.
circuit.
c.
series circuit.
b.
load.
d.
parallel circuit.
 

4. 
Charging by ____ occurs when electrons are transferred from one object to another by direct contact.
a.
reduction
c.
induction
b.
conduction
d.
friction
 

5. 
A circuit in which different loads are located on separate branches is called a(n)
a.
open circuit.
c.
series circuit.
b.
open load.
d.
parallel circuit.
 

6. 
The law of electric charges states that
a.
every action has an equal and opposite reaction.
b.
charged objects that move produce electric current.
c.
the energy of charges and mass are interchangeable.
d.
like charges repel and opposite charges attract.
 

7. 
Objects can become charged by
a.
friction.
c.
induction.
b.
conduction.
d.
All of the above
 

8. 
All matter is composed of very small particles called
a.
photons.
c.
atoms.
b.
molecules.
d.
elements.
 

9. 
The rate at which charge passes a given point is called
a.
current.
c.
potential difference.
b.
static electricity.
d.
an ampere.
 

10. 
An object becomes charged when the atoms in the object gain or lose
a.
protons.
c.
electrons.
b.
neutrons.
d.
All of the above
 

11. 
All circuits include
a.
an energy source, a load, and wires.
b.
an energy source, a resistor, and a battery.
c.
a battery, a light bulb, and a switch.
d.
a battery, wires, and a switch.
 

12. 
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
a.
friction destroyed electrons in the rod.
b.
the silk has become negatively charged.
c.
protons have moved to the rod.
d.
glass attracts more protons.
 

13. 
When a switch is closed, two pieces of conducting material
a.
touch, allowing the electric charges to flow through the circuit.
b.
touch, preventing the electric charges from flowing through the circuit.
c.
do not touch, allowing the electric charges to flow through the circuit.
d.
do not touch, preventing the electric charges from flowing through the circuit.
 

14. 
The flow of electric charges is called
a.
electric current.
c.
electric force.
b.
static electricity.
d.
electric field.
 

15. 
Suppose you have four bulbs in a parallel circuit. If you were to add five more bulbs in parallel with these four, what would happen to the brightness of the bulbs?
a.
The bulbs would no longer glow.
c.
The bulbs would grow dimmer.
b.
The bulbs would grow brighter.
d.
The brightness would not change.
 

16. 
A material in which charges cannot move easily is called a(n)
a.
conductor.
c.
inductor.
b.
insulator.
d.
reductor.
 

17. 
If you bring a charged object near an electrically neutral surface without allowing the object to touch the surface, the charges in the surface are rearranged by
a.
friction.
c.
convection.
b.
induction.
d.
conduction.
 

18. 
How does a photocell convert light into electrical energy?
a.
Light contains electrons that are captured by a photocell.
b.
Light heats a photocell, and the difference in temperature creates an electric current.
c.
Light strikes silicon atoms in a photocell, ejecting electrons from the atoms.
d.
Light has mass, and the difference in mass on the photocell causes an electric current.
 

19. 
A circuit in which all parts are connected in a single loop is called a(n)
a.
open circuit.
c.
series circuit.
b.
open load.
d.
parallel circuit.
 

20. 
Cells are made of
a.
a conducting wire and a grounded wire.
b.
an electrolyte and a pair of electrodes.
c.
a conductor and an insulator.
d.
None of the above
 

21. 
Which of the following would LOWER the electrical resistance of a wire?
a.
making the wire thinner
c.
lowering the temperature of the wire
b.
increasing the wire's length
d.
using denser material for the wire
 

22. 
A device used to protect buildings from electrical fires is a(n)
a.
electric meter.
c.
fuse.
b.
circuit breaker.
d.
Both (b) and (c)
 

23. 
The loss of static electricity as charges move off an object is called
a.
electric charge.
c.
electrical induction.
b.
electric discharge.
d.
electrical conduction.
 

24. 
____ is the energy per unit charge and is expressed in volts.
a.
Potential charge
c.
Potential force
b.
Potential current
d.
Potential difference
 

25. 
A device that can convert chemical energy to electrical energy is a
a.
lightning rod.
c.
light bulb.
b.
cell.
d.
All of the above
 

26. 
Which of the following is the correct expression relating power, voltage, and current?
a.
intro_to_electricit_files/i0270000.jpg
c.
intro_to_electricit_files/i0270001.jpg
b.
intro_to_electricit_files/i0270002.jpg
d.
intro_to_electricit_files/i0270003.jpg
 

27. 
All the loads in a series circuit
a.
use the same voltage.
c.
have the same resistance.
b.
share the same current.
d.
have the same power.
 

28. 
Which of the following bulbs would burn the brightest?
a.
40 W
c.
100 W
b.
65 W
d.
120 W
 

29. 
Resistance is affected by
a.
temperature.
c.
length.
b.
thickness.
d.
All of the above
 

30. 
Every cell contains a mixture of chemicals that
a.
can conduct a current.
c.
acts as an insulator.
b.
can induct a current.
d.
is grounded.
 

31. 
The greater the potential difference,
a.
the lesser the current.
c.
the lesser the static electricity.
b.
the greater the current.
d.
the greater the static electricity.
 

32. 
Which of the following is the correct expression for Ohm's law?
a.
intro_to_electricit_files/i0330000.jpg
c.
intro_to_electricit_files/i0330001.jpg
b.
intro_to_electricit_files/i0330002.jpg
d.
None of the above
 

33. 
Examine the wires below and answer the question that follows.
intro_to_electricit_files/i0340000.jpg

Which wire has the greatest resistance?
a.
Wire A
b.
Wire B
c.
They both have the same resistance.
d.
It cannot be determined from the information given.
 

34. 
When a zinc electrode and a copper electrode are dipped in a liquid electrolyte, the zinc electrode becomes negatively charged because a chemical reaction leaves extra
a.
protons on the zinc electrode.
c.
electrons on the zinc electrode.
b.
protons on the copper electrode.
d.
electrons on the copper electrode.
 

35. 
Opposition to the flow of electric charge is called
a.
voltage.
c.
potential difference.
b.
current.
d.
resistance.
 

36. 
The rate at which electrical energy is used to do work is called
a.
electric current.
c.
electric power.
b.
electrical potential.
d.
static electricity.
 

37. 
A material through which charges can move easily is called a(n)
a.
conductor.
c.
inductor.
b.
insulator.
d.
reductor.
 

Completion
Complete each sentence or statement.
 

38. 
____________________ is the rate at which charge passes a given point. (Current or Induction)
 

 

39. 
A _________________________ of 12 V exists between the poles of a common car battery.
(resistance or potential difference)
 

 

40. 
Charges flow easily in a(n) ____________________. (insulator or conductor)
 

 

41. 
Lightning is a form of ____________________. (static electricity or electric discharge)
 

 

42. 
A ____________________ converts chemical energy into electrical energy. (battery or photocell)
 

 

43. 
A ____________________ is a complete, closed path through which charges flow. (load or circuit)
 

 

44. 
The buildup of electric charges on an object is called _________________________.
(electric discharge or static electricity)
 

 

45. 
____________________ is the opposition to the flow of electric charge. (Resistance or Electric power)
 

 



 
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