Question: Before World War II, some radios got power through a resistance cord that had a significant resistance. Such a resistance cord reduces the voltage to

Before World War II, some radios got power through a “resistance cord” that had a significant resistance. Such a resistance cord reduces the voltage to a desired level for the radio’s tubes and the like, and it saves the expense of a transformer. Explain why resistance cords become warm and waste energy when the radio is on.

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Resistance cords become warm and waste energy when the radio is on due to the phenomenon of Joule he... View full answer

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