# Ohm’s Law MCQs

1. The formula to find current (I) when the values of voltage (V) and Resistance(R) are known is

1. I = VR
2. I = V/R
3. I = R/V
4. V = IR

2. An electric heater draws 3.6 A from a 110 V source. The resistance of the heating element is approximately

1. 30.5 Ω
2. 385 Ω
3. 31 Ω
4. 3.1 Ω

3. When there is 12 mA of current through a 1.2 k resistor, the voltage across the resistor is

1. 100 V
2. 10 V
3. 14.4 V
4. 1.4 V

4. Approximately how many milliamperes of current flow through a circuit with a 40 V source and 6.8 kohm of resistance?

1. 5.9 mA
2. 590 mA
3. 27.2 mA
4. 59 mA

5. A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?

1. 214 mA
2. 21.4 mA
3. 2 mA
4. 2.2 mA

6. How much resistance is required to limit the current from a 12 V battery to 3.6 mA?

1. 2.2 kΩ
2. 22 kΩ
3. 3.3 kΩ
4. 33 kΩ

7. What is the approximate resistance setting of a rheostat in which 650 mA of current flows through a 150 V source?

1. 23
2. 230
3. 9.7
4. 97

8. What is the voltage source for a circuit carrying 2 A of current through a 36 ohm resistor?

1. 7.2 V
2. 72 V
3. 1.8 V
4. 18 V

9. How much voltage is needed to produce 2.5 A of current through a 200 ohm resistor?

1. 80 V
2. 8 V
3. 50 V
4. 500 V