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

- I = VR
- I = V/R
- I = R/V
- V = IR

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

- 30.5 Ω
- 385 Ω
- 31 Ω
- 3.1 Ω

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

- 100 V
- 10 V
- 14.4 V
- 1.4 V

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

- 5.9 mA
- 590 mA
- 27.2 mA
- 59 mA

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

- 214 mA
- 21.4 mA
- 2 mA
- 2.2 mA

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

- 2.2 kΩ
- 22 kΩ
- 3.3 kΩ
- 33 kΩ

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

- 23
- 230
- 9.7
- 97

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

- 7.2 V
- 72 V
- 1.8 V
- 18 V

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

- 80 V
- 8 V
- 50 V
- 500 V

10. If 750 µA is flowing through 11 kΩ of resistance, what is the voltage drop across the resistor?

- 82.5 V
- 8.25 V
- 14.6 V
- 146 V

11. Ohm’s law is followed by

- Metal rectifier
- Copper electrode
- Crystal detector
- Arc lamp

12. The condition in ohm’s law is that

- The temperature should remain constant
- Ratio of V/I should be constant
- The temperature should vary
- Current should be proportional to voltage

13. Correct form of ohm’s law is

- I = VR
- V ∝ I
- V = IR
- Both (b) and (c)

14. Ohm’s law is applicable to

- Semiconductors
- Vacuum tube
- Electrolytes
- None of these

15. A current source and a resistor are connected in series. Suppose that is I_{s }= 3A and R=7 ohm. What is the voltage V across the resistor?

- 3 V
- 21 V
- 7 V
- 7.3 V

16. 1 Volt equals

- 1 joule/1 coulomb
- 1 watt/1 ohm
- 1joule/1watt
- 1watt/1coulomb

17. ohm’s law is applicable to

- Resistive circuits
- Reactive circuits
- Both resistive circuits & reactive circuits
- None of these

18. According to ohm’s law

- The voltage is constant to current
- The voltage is proportional to current
- Voltage is inversely proportional to current
- The voltage is proportional to resistance

19. In a circuit a 33 Ω resistor carries a current of 2A. The voltage across the resistor is

- 33 V
- 66 V
- 80 V
- 132 V

20. If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be

- A voltage source
- A current source
- Both of above
- None of the above