Question

A single-phase half bridge inverter is connected to a 230 V dc source which is feeding a R load of 10 Ω. Determine the fundamental power delivered to the load.

(a) 1.07 W

(b) 107.2 W

(c) 1.07 kW

(d) 107.2 kW

This question was addressed to me by my school teacher while I was bunking the class.

The question is from Quality of Inverters in chapter Inverters of Power Electronics

Answer 1

Right choice is (c) 1.07 kW

For explanation I would say: The fundamental power is the power delivered to the load due to the fundamental components of voltage and current.

V1 (rms) = 2Vs/√2π = 103.552 V

I1 (rms) = V1/R = 10.3552 A

P = (I1)^2 x R = 1072.3 W = 1.0723 kW.