When stated as a percentage, the useful energy transferred by a device divided by the total energy supplied to the device is known as the device's __________. What one word completes the sentence?

Computers, mobile phones and tablets are technological advances that have __________ the consumption of energy per person. What word completes the sentence?

Energy transferred electrically is measured in __________. What one word completes the sentence? Give the full name, not the symbol.

Julian put a heater into a block of copper and recorded the temperature of the block every minute for ten minutes. His results are below. In order to calculate the amount of energy transferred, he multiplied the time in seconds by the __________ of the heater. What word completes the sentence?

Learning goal 1: Select the definition of useful energy.Output energy that is put to the intended useOutput energy that is not put to the intended useEnergy supplied to a deviceEnergy that comes out of a device

Present the energy balance as a percentage.