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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)
Voltage ( = Electric Potential ) An electric charge alters the space around it. Throughout the space around every charge is a vector thing called the electric field. Also filling the space around every charge is a scalar thing, called the voltage or the electric potential. Electric fields and voltages are two different ways to describe the same thing. (Note on terminology: The text book uses the term electric potential, but it is easy to confuse electric potential with potential energy, which is something different. So I will use the term voltage instead.) Voltage overview The voltage at a point in empty space is a number (not a vector) measured in units called volts (V) . Near a positive charge, the voltage is high. Far from a positive charge, the voltage is low. Voltage is a kind of electrical height. Voltage is to charge like height is to mass. It takes a lot