Section 23.2
Applications of Circuits
Practice Test
1.
Why must an ammeter have an extremely low resistance?
a.
High resistance will change the current in the circuit you want to measure.
b.
High resistance reduces risk of fire.
c.
High resistance ensures there are fewer ohms.
d.
High resistance changes the voltage reading.
Hint
2.
Why does running too many appliances on one circuit cause a fuse to blow or a circuit breaker to shut off?
a.
As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of current.
b.
As more resistors are added in parallel, the total resistance decreases, which causes an increase in the total amount of voltage.
c.
The current drops to almost zero.
d.
The voltage becomes too much for the circuit to handle.
Hint
3.
How is a circuit breaker different from a fuse?
a.
A circuit breaker does not detect current.
b.
A circuit breaker is less sophisticated.
c.
A circuit breaker causes fires.
d.
A circuit breaker can be used mutliple times.
Hint
4.
Voltmeters must have __________.
a.
very high currents
b.
very high voltage
c.
very low resistance
d.
very high resistance
Hint
5.
What happens when an electric switch is turned off?
a.
A circuit breaker turns off.
b.
The circuit becomes a series circuit.
c.
The circuit is broken.
d.
There is a short circuit.
Hint
6.
A voltmeter should be connected to a circuit in __________.
a.
short form
b.
series
c.
parallel
d.
series-parallel
Hint
7.
What causes a fuse to blow?
a.
too high a current
b.
too much resistance
c.
too low a resistance
d.
too high a voltage
Hint
8.
Current is measured by a(n) __________.
a.
ohmmeter
b.
electrometer
c.
voltmeter
d.
ammeter
Hint
9.
How does a ground-fault interrupter work?
a.
It detects small differences in voltage caused by an extra voltage path and opens the circuit.
b.
It detects small differences in resistance and opens the circuit.
c.
It detects small differences in current caused by an extra current path and opens the circuit.
d.
It detects small differences in temperatures and opens the circuit.
Hint
10.
Electrical wiring in homes uses __________ circuits.
a.
series
b.
overloaded
c.
parallel
d.
voltage
Hint
