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Two 1 mm thic...

Question

Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 micro-ohms and current flow time of 0.2 second, heat generated during the process will be

A

1000 Joule

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B

02 Joule

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C

5 Joule

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D

1 Joule

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Solution

The correct option is A 1000 Joule
$Heat generated during the process$

$= I^{2} R Δ t = (5000)^{2} \times (200 \times 10^{- 6}) \times 0.2 = 1000 J$

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