Electrician Electrical Theory and Math

Question 1

What is the formula for calculating electrical power?

Accepted Answer

P = V × I

Answer

Power (P) in watts equals voltage (V) multiplied by current (I), expressed as P = V × I.

Question 2

A circuit has a voltage of 120V and a resistance of 20 ohms. What is the current?

Accepted Answer

6 amps

Answer

Using Ohm's Law, I = V/R = 120/20 = 6 amps.

Question 3

In a series circuit, how does total resistance compare to individual resistors?

Accepted Answer

Total resistance is the sum of all resistors

Answer

In a series circuit, total resistance equals the sum of all individual resistances (RT = R1 + R2 + R3...).

Question 4

What unit is used to measure electrical resistance?

Accepted Answer

Ohm

Answer

Electrical resistance is measured in ohms (Ω), named after physicist Georg Simon Ohm.

Question 5

What is the power factor of a purely resistive circuit?

Accepted Answer

1.0

Answer

A purely resistive circuit has a power factor of 1.0 because voltage and current are perfectly in phase.

Electrician Practice Test