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Electricity is basically the flow of electrons. The potential to move or 'pressure' is called the Voltage (v, Volts). The rate at which it flows is called the current, (I, Amps). Each different medium the electrons flow through have different properties that restrict or allow current to flow through. This is known as resistance (R, Ohms). There is a constant relationship between these factors,
This can be manipulated to Resistance = Voltage / Current or Current = Voltage / Resistance. Generally devices are spoken of as requiring a certain power.
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