Two conducting wires of the same material and of equal lengths and equal diameters are connected in series and then in parallel in circuit across the same potential difference. The ratio of heat produced in series and parallel combination would be? (don't need to solve the question just explain why time is same in both the cases)
The heat formula is: $Heat = I^2Rt$ where I is current, R is resistance and t is time.
To take ratios of heat in both series and parallel connection we are taking the same resistance R, the same current I.
So we have to take the same time t as well. Then only we can compare the heats in series and parallel combinations.
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