Question

Unit of electrical power is:

• A. volt
• B. watt
• C. joule
• D. coulomb

Hint:

The unit of electrical power is the watt (W), defined as one joule per second.

Answer 1

The Correct Option is B

Electrical power is defined as the rate at which work is done or energy is transferred. It is measured in watts (W),
where:

\[ P = \frac{W}{t} \] Where \( P \) is the power, \( W \) is the work done (energy transferred), and \( t \) is the time taken.

Step 1: Volt.
Volt (V) is the unit of electrical potential difference or electromotive force (EMF). It is not the unit of power.

Step 2: Watt.
Watt (W) is the unit of electrical power. One watt is equal to one joule per second. This is the correct unit for power.

Step 3: Joule.
Joule (J) is the unit of energy, not power. It is used to measure the amount of work done or energy transferred.

Step 4: Coulomb.
Coulomb (C) is the unit of electric charge. It is not the unit of power.

Step 5: Conclusion.
Thus, the unit of electrical power is watt. The correct answer is (B).