The net resistance of the circuit between A and B is

A car battery of emf 12 V and internal resistance $$5 \times {10^{ - 2}}$$ $$\Omega $$., receives a current of 60 amp, from external source, then terminal potential difference of battery is

Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistances

The potentiometer is best for measuring voltage, as