Question

A torch has 150J of energy supplied from a battery,
70J are transferred to light, 80J goes to heat, what is
the efficiency of the torch?

Answer 1

The efficiency of the torch light from the total energy supplied and useful energy is 46.7%.

Efficiency of the torch

The efficiency of the torch is the amount of energy used to produce light compared to the total energy supplied to the torch light. This can also be called useful energy.

Total energy supplied to the torch = 150 J

Total energy used to produce light = 70 J

The efficiency of the torch light is calculated as follows;

Efficiency = 70/150 x 100%

Efficiency = 46.7%

Thus, the efficiency of the torch light from the total energy supplied and useful energy is 46.7%.

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