The chemical energy stored in the chemicals stored inside a cell converts into electrical energy. When the chemicals of the cell are used up, it stops producing electricity.

The cells used in calculators are known as button cells, as they resemble the shape of a button. The plates of these cells are made from compounds of nickel and cadmium. The main advantage of these cells is that they can stay in an active stage for months without any leakage.

When two or more than two electric cells are connected together in such a way that the positive terminal of one cell is connected to the negative terminal of the other, then we call it a battery. A simple connection showing the combination of two electric cells to form a battery is shown below:

Current flows in our house appliances through the main switch. When it is turned off, flow of current stops and our lights and fans go off.

The complete circuit diagram so that-the bulb glows is given below
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(a) Vimlesh is intelligent and has good knowledge of current and its hazard.
(b) A plastic glove is an insulator. It does not conduct electricity.

(a) Radhika has good concept of electrical circuit and its uses. She is also cooperative to her friend.
(b) There may be the incorrect sequence of cell that is used by her

Bulb has two terminals because it is connected to the terminals of a cell or a battery so that current passes through the filament.

Among copper, silver and aluminium, we use copper and aluminium not silver for household wires because copper and aluminium are much cheaper than silver and silver is used as an ornaments and is also heavier than copper and aluminium.

Switch is a simple device that is used to either break the electric circuit or to complete it. With the help of a switch, we can use an appliance according to our desire.
The switches used in lighting of electric bulbs and other devices in home works on the same principle.
Some electrical gadgets that are switches built into them are as follows:
(i) Torch
(ii) Table fan
(iii) Television set
(iv) Radio
(v) Electric iron

(i) Light helps us to see an object.
(ii) It converts chemical energy into light energy.
(iii) The values exhibited by Ravi are caring, love and presence of mind.

(i) Rubber gloves and rubber slippers are insulators which can not conduct electricity. So they were given by Paheli to protect her father from electric shock.
(ii) Values shown by Paheli are love, concern and presence of mind.

It is compulsory to keep a fire extinguisher near the meter room of housing societies so that it can be used easily to douse electric fires caused by electric sparks.

Human body is a good conductor of electricity because if we stand barefoot on the ground and touch an electric wire, we will get an electric shock.

The two insulators are:
(i) Plastic (ii) Rubber
The two conductors are:
(i) Aluminium (ii) Copper

Some devices which make use of the electric cells are:
(i) Transistor radio, (ii) Camera, (iii) Wrist watch, (iv)Alarm clock.

Materials through which electric current cannot flow are called as insulators. For example: rubber.

It can convert chemical energy into electricity and can also store it.

Yes, she will succeed because aluminium is a conductor of electricity, it will complete the electrical circuit and bulb will glow.

A fused bulb does not glow because in a fused bulb, the filament of bulb burns up and connection is broken or incomplete, so the current cannot flow.

An electric switch is a device used to complete or break an electric circuit. Usually, it is manually operated.
Purpose of using electric switch: In 'ON' position, the switch allows the current to flow through the circuit. Thus, the circuit becomes a closed circuit. In 'OFF' position, the switch does not allow current to flow through the circuit. Thus, the circuit becomes an open circuit.
Examples: Electrical appliances such as fans, electric lamps, washing machines, juicer and mixer, TV radio, etc, have switches.

An electric cell consists of a cylindrical pot which is covered by a thick paper sheet.

It consists of two terminals. One is called positive terminal and the other is called negative terminal. The metal cap is the positive terminal and the metal disc is the negative terminal of the electric cell.
The production of electric current takes place due to the chemical reactions inside the cell. The chemicals are present between the outermost covering of the cell and carbon rod.

This can be done by arranging the circuit as the given diagram.
One terminal should be connected to the terminal of the cell directly and other terminal can be connected using the given wire.

The arrangement of bulb should be such that positive terminal of a battery touches the base of the bulb. When switch ON, bulb will glow.