Licensed Electrical Contractor Electrical Contractor Electrical Theory & Fundamentals 2

Question 1

A 240-volt circuit supplies a 5,000-watt electric heater. What is the current draw of the heater?

Accepted Answer

20.83 amps

Answer

Using P = V × I, the current is 5,000 ÷ 240 = 20.83 amps.

Question 2

What is the total resistance of three 30-ohm resistors connected in parallel?

Accepted Answer

10 ohms

Answer

For identical resistors in parallel, total resistance equals one resistor's value divided by the number of resistors: 30 ÷ 3 = 10 ohms.

Question 3

Which type of electrical current periodically reverses direction?

Accepted Answer

Alternating current (AC)

Answer

Alternating current reverses its direction of flow at regular intervals, typically 60 times per second in the US.

Question 4

In a series circuit with a 120-volt source and two equal resistors, what is the voltage drop across each resistor?

Accepted Answer

60 volts

Answer

In a series circuit, voltage divides proportionally, so two equal resistors each drop half the source voltage: 120 ÷ 2 = 60 volts.

Question 5

What is the power factor of a purely resistive AC circuit?

Accepted Answer

1.0

Answer

A purely resistive load has voltage and current perfectly in phase, resulting in a power factor of 1.0 (unity).

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