Electricity Tes...

If the equivalent resistance is to be increased, then the number of resistances should be connected in:

Why is electrical wiring usually made from copper?

The equivalent resistance due to series connection of $$10\ \Omega$$ and $$10\ \Omega$$ resistors is 

In any electric circuit, when the switch is on and the current is flowing through it why do the wire, switches, bulb or devices in the circuit become hot?

In the series combination of two or more than two resistances.

A light bulb is rated at 100 W for a 220 V ac supply. The resistance of the bulb is then

If five equal pieces of $$25\Omega$$ are connected in parallel, then their equivalent resistance will be............

In a house, individual powers of two elements are $$100\ W\ 100\ W$$. The effective power of their series combination will be :

Combine three resistors $$5\Omega, 4.5\Omega$$ and $$3\Omega$$ in such a way that the total resistance of this combination is maximum:

The smallest resistance that can be obtained by combining 10 resistors each of resistance $$10 \Omega$$ is