A three-phase load of three equal impedances connected in delta across a balanced 400V supply takes a line current of 10A at a power factor of 0.7 lagging. Calculate from the first principles: (i) The...

A three-phase load of three equal impedances connected in delta across a balanced 400V supply takes a line current of 10A at a power factor of 0.7 lagging. Calculate from the first principles: (i) The phase current (ii) The total power  (iii) the total reactive VAR.