4 Would only one wattmeter be needed to measure the total th

4. Would only one wattmeter be needed to measure the total three-phase active power on a balanced three-phase four-wire system? Explain.

For a balanced three phae system the power consumed in all the 3 phases are same. So we can measure the total active power by measuring the one phase active power by connecting the wattmeter between one line and the neutral line. Total power =3*one phase power reading