Basic Electrical Engineering

Saturday, 11 October 2014

Watts = power

watts = volt * ampere * power factor

watts = v * i * p.f

Example :

To find watts in single phase electric heater having 3.2 amps and operating at 230 V ,0.8 power factor .

Formula :

Watts(P) = V * I *P.F

= 230 * 3.2 * 0.8

P = 588 watts

How to find VA (or) Volt ampere

VA = Volt ampere

VA = volt * ampere

VA = V*I

Example :

To find VA in Single phase 220 v , 5 A Air cooler.

V = 220 volts

A = 5 amps

Formula :

VA = V*I

= 220*5

VA = 1100 Volt ampere