A 100 W bulb is designed to operate at 220 V. If it is connected across a 110 V source, assuming the resistance remains constant, what power will it dissipate?

A house wife uses a ${\rm{100}}\,\,{\rm{W}}$ bulb ${\rm{8}}\,\,{\rm{h}}$ a day , and an electric heater of ${\rm{300}}\,\,{\rm{W}}$ for ${\rm{4}}\,\,{\rm{h}}$ a day. The total cost for the month of June at the rate of ${\rm{0}}{\rm{.05}}\,{\rm{ rupee }}\,{\rm{per}}\,{\rm{ unit}}$ will be

An electric kettle boils some water in ${\rm{16}}\,{\rm{ min}}$. Due to some defect, it becomes necessary to remove ${\rm{10}}\,\,{\rm{\% }}$ turns of heating coil of the kettle. Now, how much time will it take to boil the same of water ?

A ${\rm{5}}{\rm{.0 }}\,{\rm{A}}$ current is setup in an external circuit by a ${\rm{6}}{\rm{.0}}$ storage battery for ${\rm{6}}{\rm{.0 }}\,{\rm{min}}$. The chemical energy of the battery is reduced by

A $60\,\,watt$ bulb carries a current of $0.5\,\,amp$. The total charge passing through it in $1\,\,hour$ is

When a copper voltmeter is connected with a battery of emf ${\rm{12}}\,\,{\rm{V}}$, 2 g of copper is deposited in ${\rm{30}}\,\,{\rm{min}}$. If the same voltmeter is connected across ${\rm{6}}\,\,{\rm{V}}$ battery, the mass of copper deposited in ${\rm{45}}\,\,{\rm{min}}$ would be

The voltage of clouds is $4\,\, imes \,\,{10^6}\,\,{\rm{V}}$ with respect to ground. In a light ning strike lasting ${\rm{100}}\,\,{\rm{ms}}$, a charge of ${\rm{4}}\,\,{\rm{C}}$ is delivered to the ground. The power of lightning strike is

In a house there are 4 bulbs each of $50W$ and 5 fans each of $60W$. If they are used at the rate of 6 hours a day, the electrical energy consumed in a month of 30 days is

The heat produced by a ${\rm{100 W}}$ heater in $2\,\,min$ will be equal to

For driving a current of $2\,A$ for $6\,\,minutes$ in a circuit, $1000\,\,J$ of work is to be done. The e.m.f. of the source in the circuit is

An electric kettle boils some water in ${\rm{16}}\,{\rm{ min}}$. Due to some defect, it becomes necessary to remove ${\rm{10}}\,\,{\rm{\% }}$ turns of heating coil of the kettle. Now, how much time will it take to boil the same of water ?