Glencoe Science Level Blue

Chapter 22: Electricity

Electricity

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