Discussion
The heat generated (H) in resistance welding is expressed by:
Answer: A
The heat generated is \(H = I^{2}Rt\).
Resistance welding relies on Joule heating: a heavy current \(I\) passed for time \(t\) through the resistance \(R\) of the joint releases heat \(I^{2}Rt\). Because the heat rises with the square of the current, resistance welding machines supply very large currents at low voltage for a fraction of a second.
The other forms misplace the square. \(IR^{2}t\) and \(IRt^{2}\) are not Joule's law, and 2IRT has no physical basis; only the current is squared.
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