GCSE Electricity Equations

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Below are all of the equations you need to remember and be able to use. If you want this list in a printable PDF format Click here to download.

Remember – potential difference is the same as voltage. Check below the list to find the SI units for each quantity.

Hint: Click on an equation and you'll be sent to its calculator.

$$ P = \frac{E}{t} $$

power = energy transferred ÷ time

$$ P = \frac{W}{t} $$

power = work done ÷ time

$$ \text{Efficiency} = \frac{\text{Useful Output Energy Transfer}}{\text{Total Input Energy Transfer}} $$

$$ \text{Efficiency} = \frac{\text{Useful Power Output}}{\text{Total Power Input}} $$

$$ Q = I \times t $$

charge flow = current × time

$$ V = I \times R $$

potential difference = current × resistance

$$ P = V \times I $$

power = potential difference × current

$$ P = I^2 \times R $$

power = (current)² × resistance

$$ E = V \times Q $$

energy transferred = charge flow × potential difference

$$ E = V \times I \times t $$

energy transferred = potential difference × current × time

$$ W = V \times Q $$

work done = potential difference × charge flow

SI Units for GCSE Electricity Equations

SI units are an international standard system of units that are used to avoid confusion and mishaps when changing between imperial and metric units. SI units are metric and should always be used when doing calculations in science.

GCSE Electricity Equations

GCSE Electricity Equations Quiz

V = IR Calculator

P = VI Calculator

P = I²R Calculator

P = W ÷ t Calculator

P = E ÷ t Calculator

Q = I x t Calculator

E = V x I x t Calculator

E = P x t Calculator

E = V x Q Calculator

W = V x Q Calculator