Filler material is.... A... in resistance welding and the

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Filler material is.... A... in resistance welding and the heat generated in the process is directly proportional to.... B....

1. used/not used
2. square of the current/cube of the current
3. cube of the current
4. not used
5. None of these

Correct Option: E

Not used & square of the current H = I² Rt.