Electricity Tes...

Equivalence Resistance?

An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in $$10\ min$$. When the other coil is used the water boils in $$40\ min$$. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be

In the network atom in figure, the equivalent resistance between the  point A and B is :-

If two resistances $${R_1} = \left( {10.0 \pm 0.1} \right)\Omega \;and\;{R_2} = \left( {20.0 \pm 0.1} \right)\Omega \;are\;connected$$ in series, then the maximum percentage error in its equivalent resistance will be

 Two copper wires are of same length one of the twice as thick as the other. Then the resistance of the two wires are in the ratio of :

Power dissipated across the $$8\Omega$$ resistor in the circuit shown here is $$2W$$. The power dissipated in watt units across the $$3\Omega$$ resistor is

$$P. Q$$ and $$R$$ are three resistances. When $$P, Q$$ and $$R$$ are connected in parallel, their total resistance is $$3 \Omega.$$ When $$P$$ and $$Q$$ are connected in parallel their total resistance is $$10/ 3\ \Omega.$$ When $$P$$ and $$R$$ is connected in series, their total resistance is $$15\ \Omega.$$ Find the correct value for $$P, Q$$ and $$R.$$

The equivalent resistance of fig shown between 'a' and 'b' is

Find a TRUE statement

A wire of resistance 'R' is bent into a circular ring of radius r. Equivalent resistance between two points 'x' and 'y' on its circumference, when angle XOT is A, can be given by