Ohm's Law MCQ Theory Practice Test - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?
(A) 8 V
(B) 320 V
(C) 3.2 V
(D) 32 V

2. When 12 V are applied across a 68 Î© resistor, the current is
(A) 816 mA
(B) 17.6 mA
(C) 176 mA
(D) 8.16 mA

3. What is the approximate resistance of a rheostat if the voltage source is 18 V and the current is 220 mA?

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

5. Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor?

6. How much current is produced by a voltage of 18 kV across a 15 kÎ© resistance?
(A) 1.2 A
(B) 12 A
(C) 120 mA
(D) 12 mA

7. A resistance of 3.3 MÎ© is connected across a 500 V source. The resulting current is approximately
(A) 15.1 ÂµA
(B) 151 ÂµA
(C) 66 mA
(D) 660 mA

8. Approximately how many milli-amperes of current flow through a circuit with a 40 V source and 6.8 kÎ© of resistance?
(A) 27.2 mA
(B) 59 mA
(C) 5.9 mA
(D) 590 mA

9. If 750 ÂµA is flowing through 11 kÎ© of resistance, what is the voltage drop across the resistor?
(A) 8.25 V
(B) 82.5 V
(C) 14.6 V
(D) 146 V

10. When there is 12 mA of current through a 1.2 kÎ© resistor, the voltage across the resistor is
(A) 14.4 V
(B) 1.4 V
(C) 100 V
(D) 10 V

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