Three Phase Power Measurement 
The input power to a 3-phase a.c. motor is measured as 5kW. If the voltage and current to the motor are 400V and 8.6A respectively, determine the power factor of the system?
Two watt meters are connected to measure the input power to a balanced 3-phase load by the two watt meter method. If the instrument readings are 8kW and 4kW, determine the load power factor.
The total number of phase sequences in a three phase AC system is
Three loads, each of resistance 30, are connected in star to a 415 V, 3-phase supply. Determine(a) the system phase voltage, (b) the phase current
By using two watt meter method, power can be measured in
The two watt meter method is applicable for