Ohm's Law MCQ Study Materials - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. What is the voltage source for a circuit carrying 2 A of current through a 36 Î© resistor?
(A) 1.8 V
(B) 18 V
(C) 7.2 V
(D) 72 V

2. If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is

3. A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms.

4. Ohm's law describes how current is related to voltage and resistance.
(A) True
(B) False

5. How much resistance is needed to draw 17.6 mA from a 12 volt source?

6. How much voltage is needed to produce 2.5 A of current through a 200 Î© resistor?
(A) 50 V
(B) 500 V
(C) 80 V
(D) 8 V

7. The formula for finding voltage when resistance and current are known is V = I/R.
(A) True
(B) False

8. The formula to find I when the values of V and R are known is
(A) I = VR
(B) I = R/V
(C) V = IR
(D) I = V/R

9. The ampere is the unit of resistance.
(A) True
(B) False

10. An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately