Efficiency useful power output total power input. Efficiency frac useful power transferred total power supplied.
The efficiency can be calculated as a decimal or a percentage.
Efficiency formula gcse physics. During a movement or change of state etc energy is usually lost as heat energy to the surroundings the energy inputted is therefore always higher than the useful energy taken out efficiency useful energy out energy in x 100. Efficiency frac useful. Efficiency useful energy out total energy in for a decimal efficiency or efficiency useful energy out total energy in 100 for a percentage efficiency.
As power is equal to useful energy transferred per second another way to calculate efficiency is to use the formula. Equations given in the exam. Efficiency has no units.
A resource prepared for aqa trilogy energy lesson on calculating efficiency. K 1 2 mv gpe mass gravitational field strength height 𝑃 ℎ power work done time taken energy transferred time taken. Learn about and revise the rate of energy transfer and calculating power and efficiency with gcse bitesize physics.
Designed by the teachers at save my exams for the cie igcse physics 0625 0972 syllabus. You need to remember the equations for efficiency. The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways.
Efficiency frac useful energy transferred total energy supplied. It can be written as a number between 0 and 1 or as a. Efficiency useful energy output total energy input.
Free physics revision notes on efficiency. The efficiency can be calculated as a decimal or a percentage using the equations. Efficiency is a measurement of how much energy is converted usefully compared to how much is wasted.
Efficiency useful power out total power in. Efficiency useful energy out total energy in.
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