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  4. When an AC current passes through a resistor there is dissipation of

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Q. When an $AC$ current passes through a resistor there is dissipation of

Alternating Current

Solution:

Joule heating is given by $i^{2} R$ and depends on $i^{2}$ (which is always positive whether $i$ is positive or negative) and not on $i$. Thus, there is joule heating and dissipation of electrical energy when an $AC$ current passes through a resistor.