# Joule Law Statement

The heat generated in the conductor for a given time is directly
proportional to

- Square of current passes through conductor for a given time
- Directly proportional to resistance for a given current and time
- Directly proportional to time for current flows through resistance

## Joule Law Formula

According to Joule Law

H = I^{2}Rt

Where

H = Heat generated

I = Current passes
through resistance

R = Resistance

t = Time for
current flows through resistance ( second )

## Example of Joule Law

**An electric iron of
resistance 10 ohm takes current of 3 Amp. Calculate the amount of heat
generated in 60 second.**

Solution

I = 3 Amp

R = 10 ohm

t = 60 second

H = I^{2}Rt

= ( 3 )^{2}
×10 × 60

= 9 ×10 × 60

= 540 Joule

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