Multiple Choice Questions on Electrical voltage

## SI unit of voltage is

SI unit of voltage is:

- volts
- amps
- watts
- ohms

Correct answer: 1. volts

SI unit of voltage is volts

More MCQs on Electrical Engineering Units

## By Definition the formula of voltage is

By Definition the formula of voltage is:

- V = WQ
- V = W + Q
- V = W – Q
- V = W/Q

Correct answer: 4. V = W/Q

## If 2 joules of energy is required to move a charge of 2 coulombs from one point to other, what is the potential difference between points

If 2 joules of energy is required to move a charge of 2 coulombs from one point to other, what is the potential difference between points:

- 1 volt
- 2 volts
- 4 volts
- 0.5 volt

Correct answer: 1. 1 volt

Solution: V = W/Q = 2 J / 2 C = 1 V

## The voltage between two points is 20 V. How much energy is required to move 62*10^{18} electrons from one point to another

The voltage between two points is 20 V. How much energy is required to move 62*10^{18} electrons from one point to another:

- 93.5 J
- 198.6 J
- 209.7 J
- 315 J

Correct answer: 2. 198.6 J

Explanation:

coulombs = electrons ÷ 6.2415*10^{18}

coulombs = 62*10^{18} ÷ 6.2415*10^{18} = 9.93 C

W = VQ = 20 V * 9.93 C = 198.6 J

## Voltage always remains same in

Voltage always remains same in

- Series
- Parallel

Correct answer: 2. Parallel