Question: An electric heater is plugged into an ac outlet. Since the ac current changes polarity, there is no net movement of electrons through the heating

An electric heater is plugged into an ac outlet. Since the ac current changes polarity, there is no net movement of electrons through the heating element; the electrons just tend to oscillate back and forth. How, then, does the heating element heat up? Don't we need to send electrons through the element? Explain.

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