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CBSE Class 10 Answered

when H=I^2Rt,Why is it stated that H is inversely proportional to the resistance of the wire?Please explain.
Asked by | 22 Jul, 2011, 02:08: AM
answered-by-expert Expert Answer
According to the Joule's law of heating (H=I2RT), heat produced H is directly proportional to resistance of the wire. If same current flows through two wires, then the one with higher resistance would get heated more.
 
However, in a short circuit (low resistance) where resistance is zero, the wires get overheated and melt. This is due to large current in the wire.
Answered by | 22 Jul, 2011, 09:41: AM

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