Formulae on Current Electricity


Electronic resistors have colored bands on them to denote their level of resistance. Each color represents a number from 0 to 9. In the order of the mnemonic:

Black (0), Brown (1), Red (2), Orange (3), Yellow (4) , Green (5) , Blue (6) , Violet (7) , Gray (8) , White (9)
Bye Bye Rosie Off You Go to Birmingham Via Great Western

Ohm's law can be remembered as "Volcanoes Are Rare" i.e. Volt = Amps x Resistance

Current when n identical cells are connected in series and parallel

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