Introduction to Physical Science

Chapter 20: Electricity

Electricity

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