Question

Explain why it is a bad idea to plug a device designed for a 120V circuit...

Explain why it is a bad idea to plug a device designed for a 120V circuit into a 220V circuit.

Homework Answers

Answer #1

The device designed for 120 V circuit will be equipped with a characteristic resistanc, in order to enable the flow of rated or required current for the device operation at 120 V. If 'R' is the resistance, then the rated current will be I = (120 / R) amperes. Now, if the same device is connected to a 220 V circuit, the current will be I = (220 / R). As the resitance R will be the same, the current will be 1.833 times the rated current of the device, which will damage the device, as the high current might burn the device's internal circuit. Hence, it is a bad idea to plug a device designed for a 120 V circuit into a 220 V circuit as it might totally damage the device.

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