PC Electrical Theory & Principles 2

Question 1

A series circuit has resistors of 10Ω, 20Ω, and 30Ω connected to a 120V source. What is the total current in the circuit?

Accepted Answer

2A

Answer

Total resistance = 10+20+30 = 60Ω; I = V/R = 120/60 = 2A.

Question 2

Which of the following best describes the relationship between power, voltage, and current in a DC circuit?

Accepted Answer

P = V × I

Answer

Power (watts) equals voltage (volts) multiplied by current (amperes): P = V × I.

Question 3

In a series circuit, if one resistor increases in value, the total current will:

Accepted Answer

Decrease

Answer

Higher resistance in a series circuit increases total resistance, reducing current per Ohm's Law.

Question 4

A 1,500W electric heater is connected to a 120V circuit. What is the operating current?

Accepted Answer

12.5A

Answer

I = P/V = 1,500/120 = 12.5A.

Question 5

Kirchhoff's Voltage Law (KVL) states that the algebraic sum of all voltages around any closed loop is:

Accepted Answer

Zero

Answer

KVL states that the sum of all voltage rises and drops around any closed loop must equal zero.

(PC) Professional Electrical Contractor Practice Test