Question

estimate the heat generated at the joint while joining 2metal sheets having a total resistance of 300 micro ohms it Is found that current flow is applied for 0.15seconds
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Answer 1

Explanation:

the heat generated through a resistor when a current i is flown through it in time T

i^2 r T

where r is the resistance

so r is 300 × 10 ^ -6 of 1 sheet

for 2 sheets

total r is 600 × 10 ^ -6

hence heat = i^2 600 . 10 ^-6 × 0.15

is i^2 × 12× 10^-5