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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)
A varistor is able to short these surges and spikes and keep them away from the following application. A varistor is also known as Voltage Dependent Resistor or VDR. A power surge or a spike is an increase in voltage significantly above the standard voltage of 230 volts.