BMST - Basic Math and Science Electrical Circuits and Ohm's Law Questions and Answers 3

Question 1

A circuit has a voltage of 24 V and a resistance of 8 Ω. What is the current flowing through the circuit?

Accepted Answer

3 A

Answer

Using Ohm's Law, I = V/R = 24/8 = 3 A.

Question 2

Two resistors of 10 Ω and 20 Ω are connected in parallel. What is the equivalent resistance?

Accepted Answer

6.67 Ω

Answer

For parallel resistors, 1/R = 1/10 + 1/20 = 3/20, so R = 20/3 ≈ 6.67 Ω.

Question 3

What happens to the total resistance when you add more resistors in series?

Accepted Answer

It increases

Answer

In a series circuit, total resistance is the sum of all resistors, so adding more increases it.

Question 4

A light bulb has a resistance of 240 Ω and operates on 120 V. What power does it consume?

Accepted Answer

60 W

Answer

P = V²/R = 120²/240 = 14400/240 = 60 W.

Question 5

In a series circuit with a 12 V battery and two resistors of 3 Ω and 9 Ω, what is the voltage drop across the 9 Ω resistor?

Accepted Answer

9 V

Answer

Total R = 12 Ω, I = 1 A; voltage across 9 Ω = 1 × 9 = 9 V.

BMST - Basic Math and Science Test Practice Test