Bennett Mechanical Test Electricity and Circuits 5

Question 1

What is the total current drawn from the source in a parallel circuit?

Accepted Answer

The sum of the branch currents

Answer

In a parallel circuit, the source current equals the sum of all branch currents.

Question 2

What is the resistance of a circuit that draws 4 amps from a 12-volt battery?

Accepted Answer

3 ohms

Answer

Resistance equals voltage divided by current, so 12 V ÷ 4 A = 3 ohms.

Question 3

Which of these is an insulator?

Accepted Answer

Rubber

Answer

Rubber resists the flow of electricity and is used to insulate wires.

Question 4

What component increases or decreases AC voltage in a circuit?

Accepted Answer

Transformer

Answer

A transformer steps voltage up or down using electromagnetic induction.

Question 5

If a 60-watt bulb and a 100-watt bulb run at the same voltage, which draws more current?

Accepted Answer

The 100-watt bulb

Answer

At equal voltage, higher power means higher current, so the 100-watt bulb draws more.

Bennett Mechanical Test Practice Test