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## 01/07/2021

### Joule Law

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

H = I2Rt

Where

H = Heat generated

I = Current passes through resistance

R = Resistance

t = Time for current flows through resistance ( second )

Example

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 = I2Rt

= ( 3 )2 ×10 × 60

= 9 ×10 × 60

= 540 Joule

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