State whether an electric heater will consume more electrical energy or less electrical energy per second when the length of its heating element is reduced. Give reasons for your answers.

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Solution

Length is directly proportional to resistance.

Therefore, if the length is reduced, the resistance will reduce.

Resistance is inversely proportional to current which is again proportional to energy.

So resistance is inversely proportional to energy and hence more electrical energy will flow per second.

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