Physical Science: Electricity and Magnetism, Book N

Chapter 1: Electricity

Electricity

1
What flows in an electric circuit?
A)ions
B)electrons
C)protons
D)neutrons
2
When something is grounded, what happens to the excess electrical charge?
A)It is stored in the grounded equipment.
B)It is drained into the atmosphere.
C)It disappears.
D)It is drained into the Earth.
3
A long, thin wire has __________ than a short, thick wire.
A)lesser voltage
B)greater voltage
C)lesser resistance
D)greater resistance
4
How much energy is needed to run a 50-W lightbulb for 5 hours?
A)10 kWh
B)0.01 kWh
C)250 kWh
D)0.25 kWh
5
How do insulators and conductors differ?
A)Insulators allow protons to pass through them.
B)Conductors do not allow an electric current through them.
C)Insulators do not allow electrons to pass through them easily.
D)Conductors allow protons to pass through them.
6
What force keeps protons and neutrons together in a nucleus?
A)gravitational force
B)strong nuclear force
C)electrical force
D)weak nuclear force
7
What kind of circuit has more than one path for current flow?
A)voltage
B)conducting
C)parallel
D)series
8
Electrons have what charge?
A)neutral
B)negative
C)positive and negative
D)positive
9
An atom has lost an electron to have a charge of +1. It is now __________.
A)a proton
B)an ion
C)an electron
D)a neutron
10
Voltage measures __________.
A)the current
B)the power from a circuit
C)the resistance
D)the energy electrons have
11
Copper is an example of what?
A)an electrical force
B)a conductor
C)an ion
D)an insulator
12
Where does Las Vegas get most of its power from?
A)coal
B)the Sun
C)nuclear power
D)Hoover Dam
13
What variable does Ohm's law NOT describe?
A)current
B)power
C)voltage
D)resistance
14
Why do batteries run down?
A)the electrons in the chemicals are used up
B)there are too many electrons
C)there are too many protons
D)the protons are all gone
15
If an atom gains an electron, what is its charge?
A)positive
B)positive and negative
C)negative
D)neutral
16
Feeling a shock from a metal door handle is an example of an __________.
A)ion
B)electrical force
C)insulator
D)electrical discharge
17
As resistance increases, what happens to current?
A)It stays the same.
B)It fluctuates randomly.
C)It increases.
D)It decreases.
18
What do you feel when you receive an electric shock?
A)power
B)voltage
C)current
D)resistance
19
As voltage increases, what happens to current?
A)It increases.
B)It stays the same.
C)It fluctuates randomly.
D)It decreases.
20
What happens to the strength of an electrical field as you get closer to it?
A)It remains the same.
B)It disappears.
C)It increases.
D)It decreases.
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