Electricity Tes...

A student's $$9.0V, 7.5W$$ portable radio was left on from $$9:00\ P.M.$$ until $$3:00 A.M.$$ How much charge passed through the wires?

The diagram shows identical lamps X and connected in series with a battery. The lamps light with normal brightness.If a third lamp Z is connected in parallel with lamp X, then what will happens to the brightness of the lamp Y?

Observe the given figure and answer the following questions. The bulb will glow when a ______ is placed in between the probes.

Fuse is the most important safety device, used for protecting the circuits due to

$$4$$ bulbs rated $$100$$W each, operate for $$6$$ hours per day. What is the cost of the energy consumed in $$30$$ days at the rate of Rs. $$5$$/kWh?

Two electric bulbs have ratings respectively of $$25 \ W, 220 \ V$$ and $$100 \ W, 220 \ V$$. If the bulbs are connected in series with a supply of $$440\ V$$, which bulb will fuse?

The total electrical resistance between the points $$A$$ and $$B$$ of the circuit shown is:

Two bulbs of $$250 \ V$$ and $$100 \ W$$ are first connected in series and then in parallel with a supply of $$250 \ V$$. Total power in each of the case will be respectively 

A wire of resistance 'R' is cut into 'n' equal parts. These parts are then connected in parallel with each other. The equivalent resistance of the combination is?

Consider four circuits shown in the figure below. In which circuit power dissipated is highest?