Question

Explain the relationship between watt and volt.

Answer 1

Step 1: Units of Power and EMF:

1. The watt is the SI unit of Power (P) and the volt is the SI unit of potential difference and EMF.
2. Volt is the measure of potential difference within two terminals of a conducting wire.
3. Watt is the rate at which electrical work is performed when a current of one ampere flows across the potential difference of one volt.

Step 2: Relation between Watt and Volt:

The relation between Watt and Volt is,
$Watt=Volt\times Current=VI$

The relation between watt and volt is proportionate. That is watt is directly proportional to volt. This implies that-

1. When the electric current is kept constant, power increases with an increase in potential difference.
2. When the electric current is kept constant, power decreases with a decrease in potential difference.