ammeter - device used to measure current, ohmmeter - device used to measure resistance, voltmeter - device used to measure voltage , amperes ( amps) - unit for current, Volts - unit for voltage, ohms - unit for resistance, I - the symbol for current, a complete circuit and a potential difference - two conditions needed for current to flow, a flow of electrons - what is current ?, Diode - device that allows current to flow in one direction only, variable resistor - device that changes resisatance, LDR - device whose resistance changes with light, bulb - device that changes electrical energy into light and heat energy, symbol for a switch , symbol for a diode, the triangle end - which end of a diode is positive?, bulbs arranged in series, bulbs arranged in parallel, Ohms Law triangle , device that changes electrical energy into sound energy ,

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