Kirchhoff's first rule $$\Sigma$$I = 0 and second rule $$\Sigma$$IR = $$\Sigma$$E (where the symbols have their usual meanings) are respectively based on -

The electric power consumed by a 220 V $$-$$ 100 W bulb when operated at 110 V is

If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a -

A potential difference of 200 V is maintained across a conductor of resistance 100 $$\Omega$$. The number of electrons passing through it in 1s is