A device used to measure current. - Ammeter, The unit for current - symbol A. - Amps, The flow of electrons (or other charged particle). - Current, A circuit component that only allows current to flow in one direction. - Diode, A thick piece of wire which is designed to 'blow' (actually melt) when the current becomes too large. - Fuse, Light dependent resistor. This component's resistance changes when the light level changes. - LDR, Light emitting diode. A small bulb-like component that gives off a single colour of light when a voltage is applied. - LED, The unit for resistance - symbol Ω . - Ohm, A circuit which has wires that split, or branch off. In this type of circuit the current will also split. - Parallel circuit, The rate of use of energy/a measure of how quickly energy is transferred. - Power, This reduces the flow of current. The more there is of this, the less current. - Resistance, A component that adds resistance to a circuit. - Resistor, A circuit which only has one path for the current to flow. - Series circuit, This component's resistance changes as the temperature changes. - Thermistor, A component which can have its resistance altered using a dial or slider. - Variable resistor, The unit for voltage - symbol V. - Volt, A device used to measure voltage. - Voltmeter, The unit for power - symbol W - Watt,

Electric circuits

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