What is the power input and power output for a single-phase motor which takes 8 A from the AC supply of 250 V if it has a power factor of 0.75 lagging and has an effciency of 80%? What value of load...

What is the power input and power output for a single-phase motor which takes 8 A from the AC supply of 250 V if it has a power factor of 0.75 lagging and has an effciency of 80%?

What value of load resistance will be needed for maximum power transfer when we have a source of EMF 20 V and internal resistance 1 Ω and what will be the power transferred?