Electric Generator

A current that always flows through an electric device in the same direction is called direct current or $\mathrm{DC}$. The polarity (positive and negative) of a direct current is fixed. A current that reverses direction at equal intervals of time is called the alternating current or $\mathrm{AC}$. The polarity (positive and negative) of an alternating current is not fixed. Both $\mathrm{DC}$ and $\mathrm{AC}$ can be used for lighting and heating. Some electric devices like the television need $\mathrm{DC}$ to operate. In such cases, an adapter or a device is fitted into them to convert $\mathrm{AC}$ from the mains supply to $\mathrm{DC}$.

On the basis of above information, answer the following :

A current that always flows through an electric device in the same direction is called direct current or $\mathrm{DC}$. The polarity (positive and negative) of a direct current is fixed. A current that reverses direction at equal intervals of time is called the alternating current or $\mathrm{AC}$. The polarity (positive and negative) of an alternating current is not fixed. Both $\mathrm{DC}$ and $\mathrm{AC}$ can be used for lighting and heating. Some electric devices like the television need $\mathrm{DC}$ to operate. In such cases, an adapter or a device is fitted into them to convert $\mathrm{AC}$ from the mains supply to $\mathrm{DC}$.

On the basis of above information, answer the following :

A current that always flows through an electric device in the same direction is called direct current or $\mathrm{DC}$. The polarity (positive and negative) of a direct current is fixed. A current that reverses direction at equal intervals of time is called the alternating current or $\mathrm{AC}$. The polarity (positive and negative) of an alternating current is not fixed. Both $\mathrm{DC}$ and $\mathrm{AC}$ can be used for lighting and heating. Some electric devices like the television need $\mathrm{DC}$ to operate. In such cases, an adapter or a device is fitted into them to convert $\mathrm{AC}$ from the mains supply to $\mathrm{DC}$.

On the basis of above information, answer the following:

What is the frequency of alternating current in India?

List a few merits of alternating current.

List a few demerits of AC current.

The working principle of a generator is that it may cause the flow of electric charges by moving an electrical conductor in a magnetic field. 

Explain the basic working mechanism of an electric generator.

Differentiate between AC generator and DC generator.

Differentiate between AC current and DC current with the merits and demerits of AC current.

What is the difference between a direct current and an alternating current? How many times does $AC$ used in India change direction in one second?

An AC generator is connected to an electric appliance. In $10$ revolutions of the armature, how many times the current in the appliance changes direction?

An AC generator is connected to an electric appliance. In $5$ revolutions of the armature, the current in the appliance changes direction

The domestic electricity in India is an AC with a frequency of:

The main difference between an AC generator and a DC generator is that:

A device used for producing current is:

A rectangular coil of copper wire is rotated in a magnetic field. The direction of induced current changes once in each:

If the alternating current in India completes $50$ cycles in a second, the frequency of the AC is said to be-

Which of the following is true about a galvanometer when a direct current passes through the circuit?

Choose the incorrect statement:

In AC direction of the current is _____.