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Topic 4.6
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1
Each device in a parallel circuit…
A)uses the same amount of energy.
B)functions when a switch opens the circuit leading to the device.
C)is controlled by the same switch as all other devices in the circuit.
D)can be controlled by its own switch.
2
What would happen if all the electrical devices in a home were connected to the same parallel circuit?
A)The circuit panel would cool the wires.
B)The wires would slow down the current.
C)The wires could become extremely hot.
D)A failure in one device would cause current to stop flowing to the rest of the circuit.
3
What is the purpose of a circuit breaker or fuse in a circuit?
A)to keep the circuit closed at all times.
B)to prevent the circuit from carrying too much voltage
C)to prevent the circuit from carrying too much current
D)to increase resistance in the circuit
4
A circuit will use half as much current when…
A)the potential difference is changed from 240 V to 120 V.
B)the potential difference is changed from 120 V to 240 V.
C)the size of the cable leading to the circuit is doubled.
D)a grounding wire is added to the circuit.
5
What is a hot wire?
A)a wire that is not grounded
B)a grounded wire
C)a ground fault interrupter
D)a three-hole outlet
6
A ground fault interrupter (GFI)…
A)measures the current leaving one end of the circuit and the current entering the other end of the circuit.
B)measures the resistance leaving one end of the circuit and the current entering the other end of the circuit.
C)calculates the amount of current needed to make an appliance operate.
D)allows appliances with frayed wires to continue to work.
7
Which of the following is a safety hazard?
A)increasing the size of electrical cables
B)installing a ground fault interrupter in the kitchen
C)removing the third prong from an appliance
D)installing a 240 V circuit for a large appliance, such as an electric clothes dryer.





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