Physics GCSE

a quick set of revising notes about topics p1a and p1b used to help me revise!! :D

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Electric Current

ELECTRIC CURRENT is a FLOW of ELECTRONS round a CIRCUIT!!

if you INCREASE THE VOLTAGE - then MORE CURRENT will flow, if you DECREASE THE RESISTANCE - then LESS CURRENT will flow

current is similar to a flow of water - the pump acts as the electricity supply, the constriction acts as the resistance. if you turn on the pump, you increase the flow, if you put in more constrictions, you decrease the flow.

ELCTRONS flow the OPPOSITE WAY to CONVECTIONAL CURRENT - it flows from negative to positive, NOT vice versa!!

AC (sqiggly line) keeps CHANGING DIRECTION, DC (straight line) always flows in the SAME DIRECTION.

AC = WIGGLY DC = STRAIGHT

^^ don't forget that, and remember, the amount of CURRENT you get depends on the VOLTAGE of the power supply and the RESISTANCE of the appliance you're running.  

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