REVISION CIRCUITS

CURRENT & THE FLOW OF ELECTRONS ELECTRIC CURRENT is the amount of charge per second moving past a point in the conductor 1 COULOMB is the amount of charge that flows past a point in the circuit in 1 second when the current is 1A AMMETER measure the rate of flow of charge

POTENTIAL DIFFERENCE & EMF POTENTIAL DIFFERENCE between two points in a circuit is the difference in electrical potential energy per unit charge EMF (electromotive force) is the amount of energy the battery is able to trasfer to 1C charge when the charge moves through the battery VOLTMETER measure the amount of energy transferred to 1C charge

RESISTANCE & OHM RESISTANCE is the opposition that a conductor offers to the flow of charge. It is the ratio of voltage across the component to the current through the component OHM: A conductor has a resistance of 1ohm as a current of 1A flows through it while a potensial difference of 1V is maintained OHM'S LAW: The potential difference across a conductor is directly proportional to the current in the conductor at constant temperature..

The rate at which work is done POWER The rate at which work is done

COST OF ELECTRICITY (kWh) refers to the use of 1 kilowatt of electricity for 1 hour.

EXAMPLE

RATIO PROBLEMS

OHMIC VS NON-OHMIC CONDUCTORS Potensial difference (V) Current (A)

OHMIC VS NON-OHMIC CONDUCTORS Current (A) Potensial difference (V)

EMF=17V Ratio of resistance M to N Internal resistance Potential difference over N Resistance of Y