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Technically, VArs are the product of the rms voltage and current, or the apparent power, multiplied by the sine of the phase angle between the voltage and the current. Or in mathematical terms, the reactive power Q, (measured in units of volt-amperes reactive or VAr), is given by. Q = Vrms * Irms * sin(Ï)
1 Voltage is a measure of the energy carried by the charge. 2  Strictly: voltage is the 'energy per unit charge'. 3  The proper name for voltage is potential difference or p.d. for short, but this term is rarely used in electronics. 4  Voltage is supplied by the battery (or power supply).oltage attempts to make a current flow, and current will flow if the circuit is complete. Voltage is sometimes described as the 'push' or 'force' of the electricity, it isn't really a force but this may help you to imagine what is happening.