Electricity Tes...

An electric lamp is marked $$60 \ W$$, $$230 \ V$$. The cost of $$1 \ kilowatt-hour$$ of power is $$Rs \ 1.25$$. The cost of using this lamp for $$8 \ hours$$ is

The resistance of the filament of an electric bulb changes with temperature. If an electric bulb rated $$220 \ V$$ and $$100 \ W$$ is connected to  $$(220\times 0.8) \ V$$ source, then the power would be : 

An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 v, Now its power is

The current flowing through a lamp marked as $$50 \ W$$ and $$250 \ V$$ is

The electric passing through a metallic wire produces heat because of

A heater coil is cut into two equal parts and only one part is now use in the heater. The heat generated will now be

The conductors of resistance $$1 \Omega, 2 \Omega$$ and $$3\Omega$$ are in series in a circuit. What is the equivalent resistance in the circuit ?

If a $$5 \,V$$ battery is provoding $$2 \,A$$ current in a conductor then what is the resistance of conductor ?

Kilowatt hour is unit of

What happens to the current in each resistor when resistors of different values in parallel combination are connected to a source of electricity?