TN LLE Electrical Theory 2

Question 1

In a series circuit with three resistors of 10 ohms, 20 ohms, and 30 ohms connected to a 120V source, what is the total current?

Accepted Answer

2 amperes

Answer

Total resistance in series = 10 + 20 + 30 = 60 ohms. Current = V/R = 120/60 = 2 amperes.

Question 2

What is the power consumed by a 240V electric water heater drawing 20 amperes?

Accepted Answer

4,800 watts

Answer

Power = Voltage x Current = 240V x 20A = 4,800 watts (4.8 kW).

Question 3

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

Accepted Answer

1.0

Answer

In a purely resistive circuit, voltage and current are in phase, resulting in a power factor of 1.0 (unity).

Question 4

Two 100 ohm resistors connected in parallel have a combined resistance of:

Accepted Answer

50 ohms

Answer

For two equal resistors in parallel: Rtotal = R/2 = 100/2 = 50 ohms.

Question 5

What is the relationship between voltage, current, and resistance known as?

Accepted Answer

Ohm's law

Answer

Ohm's law (V = I x R) describes the fundamental relationship between voltage, current, and resistance.

TN LLE - Tennessee Limited Licensed Electrician Practice Test