Two batteries of emf 4V and 8V with internal resistance are connected in a circuit with a resistance of as shown in figure. The current and potential difference between the point P and Q are
Kirchhoff's current law at a junction deals with conservation of
charge
energy
momentum
all of these
A 2 kW boiler used for 1 hour everyday consumes electrical energy in thirty days equal to
120 units
60 units
15 units
30 units
