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 download it here.
Remember – potential difference is the same as voltage. Check below the list to find the SI units for each of these quantities.
Hint: Click on an equation and you’ll be sent to its calculator.
V = I x R    voltage = current x resistance
 P = V x I     power = voltage x current
P = I² x R   power = (current²) x resistance
P = W ÷ t   power = work done ÷ time
P = E ÷ t     power = energy transferred ÷ time
Q = I x t    charge flow = current x time
E = V x I x t    energy transferred = voltage x current x time
E = P x t    energy transferred = power x time
E = V x QÂ Â Â Â Â energy transferred = charge flow x voltage
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.
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