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An electric iron of resistance 20Omega t...

An electric iron of resistance `20Omega` takes a current of 5A. Calculate the heat developed in 30s

Text Solution

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The amount of heat (H) produced is given by the joule.s law of heating as
H=Vlt where, current, I=5
A time, t=30s
Voltage, V=current`xx`Resistance
`=5xx20`
`=100V`
`H=100xx5xx30=1.5xx10^(4)J`
Therefore the amount of heat developed in the electric iron is `1.5xx10^4`J.
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