Heating Effects of Electric Current and Electric Power

According to Joule's law of heating, the heat produced in any resistor is inversely proportional to the resistance of the resistor.

Explain Joule's law of heating.

A current of 1A is drawn by a filament of an electric bulb. The number of electrons passing through a cross-section of the filament in 16 seconds would be roughly______.

An electric kettle consumes 1kW of electric power when operated at 220V. A fuse wire of what rating must be used for it?

Unit of electric power may also be expressed as_____.

Which of the following represents voltage?

An electric bulb draws a current of 0.2 A when the voltage is 220 volts. The amount of electric charge flowing through it in one hour will be__________.

Calculate the resistance of an electric bulb which allows a 10A current when connected to a 220V power source?  

The rate at which electrical energy is transferred by an electric circuit is called _________.

Iron is a conductor of electricity, but when we pick up a piece of iron resting on the ground, why don’t we get electric shock?

How do we decide that a given material is a good conductor of electricity or is an insulator?

Write Joule's law of heating.

Which of the device does not depend on thermal effect of current?

It is advisable to use a material of low resistance in a heating coil.

Consider a current of $4\mathrm{A}$ passing through a coil and let the heat produced in the circuit be ${\mathrm{H}}_1$.  What happens to the heat if the current is decreased by $1\mathrm{A}$.

Calculate the amount of heat generated (in kJ) when $10 \mathrm{A}$ current flows through two resistors of resistance $1 \mathrm{\Omega }$ and $2 \mathrm{\Omega }$ respectively connected in series for $1$ minute.

Calculate the amount of heat generated (in kJ) when $10 \mathrm{A}$ current flows through two resistors of resistance $1 \mathrm{\Omega }$ and $2 \mathrm{\Omega }$ respectively connected in series for $1$ minute.