Current Electri...

The resistance of germanium .................. with rise in temperature.

The specific resistance of a rod of copper as compared to that of thin wire of copper is

The length of a conductor is doubled and its radius is halved, its specific resistance is

The maximum number of 40 W bulbs connected in parallel which can be lighted safely using a 240 V supply with a 5A fuse is.

In 220 V A.C., the value of 220 represents:

A radio-set of resistance 20 $$\Omega$$and a resistor of 4 $$\Omega$$ are connected in series with a 6V battery. What is the potential difference across the radio-set?

Two resistors of $$30 \Omega$$ and $$20 \Omega$$ are joined together in series and then placed in parallel with a $$50 \Omega$$ resistor. What is the effective resistance of the combination?

An electric cell does 5 joules of work in carrying 10-coulomb charge around the closed circuit. The electromotive force of the cell is :

What is the effective resistance between points A and B?

For a heater rated at $$4.4 \ kW \ , \ 220 \ V$$ . Calculate the current drawn by the heater.