Physics, 02.03.2021 17:10 mar4894

An energy-saving light bulb wastes 5 J of energy for every 20 J of energy it radiates as light (2 marks)
a) How much energy is supplied to it for every 20 J of energy it radiates as light?

b) Calculate its efficiency.

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An energy-saving light bulb wastes 5 J of energy for every 20 J of energy it radiates as light (2 m...