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When water is heated using a resistive coil connected to the domestic power supp

1. When water is heated using a resistive coil connected to the domestic power supply, its temperature rise depends on: (I) the supply voltage, (II) the current through the coil, and (III) the time for which voltage is supplied. Which of these matter?

 

Heat produced follows H = I²Rt, or equivalently depends on both voltage and current together with time — all three factors genuinely affect the water’s temperature rise.

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