Electricity Tes...

Two wires of same metal have the same length but their cross-sections are in the ratio 3:1. They are joined in series. The resistance of the thicker wire is $$10\Omega$$. The total resistance of the combination is:

The power supplied by the battery will be :

The power dissipated in each resistor will be :

In an electric circuit containing a battery, the charge (assumed positive) inside the battery

A technician has $$10$$ resistors each of resistance $$0.1\ \Omega$$. The largest and smallest resistance that he can obtain by combining these resistors are:

An electric toaster draws $$8\ A$$ current in a $$220\ V$$ circuit. It is used for $$2\ hr$$. What is the cost of operating the toaster if the cost of electrical energy is $$Rs.\ 4.5 / kWh$$?

Fill in the blank.

An electric heater of power $$3 \ kW$$ is used for $$10 \ h$$. How much energy does it consume? Express your answer in joule.

A bulb is connected to a cell. How is the resistance of circuit affected if another identical bulb is connected in series ?

Substances which allow electricity to pass through them are known as