Power: Measured in Watts, P in equations, Energy transferred per second, More expensive appliances have more of this, If you double the voltage this will quadruple, assuming the resistance is constant, Energy: Measured in Joules, E in equations, The thing that makes the lightbulbs light up, Carried by the electrons, Cannot be created or destroyed, Voltage: Measured in Volts, V in equations, Energy per coulomb, If you increase this, the lightbulbs will be brighter, Can be alternating or direct, Current: Measured in Amps, I in equations, Rate of flow of charge, Increasing resistance reduces this, Doubles if you double the voltage (assuming resistance is constant),

Power, Energy, Current and Voltage

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