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Electricity

TermDefinition
Electrical current The rate of flow of electrical charge
Resistance How hard it is for a current to flow through a component in a circuit
Potential difference The “push” on electrons in a circuit
Ohms law For ohmic conductors, the potential difference and resistance of a component at a constant temperature are directly proportional
Ohmic conductors Wires and resistors
Non-ohmic conductors Variable resistors LDR thermistor filament lamp diode
Filament bulbs are non-ohmic because As the p.d increases, the temperature increases, increasing resistance
Diodes are non-ohmic because They do not allow current in the reverse direction
Rule for LDR The greater the light intensity, the lower the resistance
Rule for thermistor The greater the temperature, the lower the resistance
Series amps, volts and ohm Current: the same Potential difference: shared Resistance: total resistance = sum of resistance of components
Parallel amps, volts and ohms Current: shared Potential difference: the same Resistance: total resistance < the component with the lowest resistance
Created by: That cool NAMe
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