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?

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

In $10$ revolutions of the armature the current in the appliance will change direction _____ times.

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:

The device for producing electric current is 

The frequency of AC in India is $50 \mathrm{Hz}$.

Explain why the commutator is not needed in AC generator?

AC generator has slip rings while the DC generator has a _____.

What is the difference between alternating current generator and direct current generator?

The frequency of alternating current in India is

A device used for producing current is:

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?

An alternating current is a two-directional current.

You are given following current-time graphs from two different sources:

What is the frequency of current in case II in India?