Study Notes: Electricity & Circuits

# Study Notes: Electricity & Circuits - Science Class 6

 Table of contents Electric Cell A Bulb Connected to an Electric Cell An Electric Circuit Electric Switch Electric Conductors and Insulators

## Electric Cell

A device that is used to generate an electric current through a series of chemical reactions is called the Electric cell.

### Bulb

We get light from a thin tiny wire inside the glass cover. This is called a filament. It is supported by two thicker wires, as shown in Fig. One of these thick wires is connected to the metal casing around the base of the bulb. The other is connected to the metal tip of the base. The base of the bulb and the metal tip of the base are the two terminals of the bulb. These two terminals are fixed in such a way that they do not touch each other.
The inside portion of the bulb is filled up with inert gases, like argon.

Torch Bulb

Question for Study Notes: Electricity & Circuits
Try yourself:Filament of a bulb is made up of

## A Bulb Connected to an Electric Cell

An electric cell is a device that supplies electrical energy to devices that function using electricity. Thus, an electric cell produces electricity for a torch to glow. In fact, not only a torch, an electric cell provides electricity to a number of devices, such as toys, alarm clocks, pocket radios and cameras.

An electric cell has a cap, just under which there is a plus sign. This is the positive terminal of the cell. At the other end of the cell, there is a flat metal disc with a minus sign just above the disc. This metallic disc is the negative terminal of the cell. These terminals of the cell can be used to connect it to various devices. Inside a cell, there is dark powdery stuff, which is the chemical. This chemical helps the cell to provide electricity to the device it is connected to.
When a cell is connected to a device, the strength of the chemical decreases. Finally, when the entire energy of the chemical is spent, the device connected to the cell stops functioning. A rechargeable cell or a storage battery can be recharged

A torch bulb is made up of spherical glass which is attached to a metallic base. The bulb inside a torch has a filament. This filament is supported by two thick wires at its ends. When the positive and the negative terminals of an electric cell are connected to the two terminals of a bulb, electricity passes through the filament and it starts glowing. The terminals of the bulb are fixed in such a way that they do not touch each other.

The bulbs that we use in our homes all look the same. In recent years, a different type of bulb has become popular - the compact fluorescent lamp, generally referred to as a CFL. It is an energy-saving bulb, which has a longer life than an ordinary bulb.

## An Electric Circuit

Electrical CircuitA closed path through which the electric current flows is called an electric circuit. The direction of electric current in an electric circuit is from the positive terminal to the negative terminal.

For example, a bulb glows only when the positive terminal and the negative terminal of an electric cell are connected to the two terminals of the bulb.
If the wires from the bulb are connected to the same terminal (either positive or negative), then the bulb doesn't glow.
Sometimes, the bulb may not glow even though the connections are properly made.
This is because the flow of electricity is incomplete as the filament in the bulb is broken. A broken filament bulb is said to be fused.

## Electric Switch

• A device that is used to stop the flow of electricity by breaking the circuit is called a switch
• An electric switch is a simple device that either breaks the circuit or completes it to stop or start the flow of current.
• When the switch completes the circuit, it is called closed switch.
• When the switch breaks the circuit, it is called open switch.
Closed SwitchOpen Switch

Some common types are:

• Toggle switches, which are used in our houses.
• Push-button switches, which are used in the starter of a water pump.
• Joystick switches, which are used in the remote control unit of a toy car.

Question for Study Notes: Electricity & Circuits
Try yourself:Bulb glows only in

## Electric Conductors and Insulators

• All materials do not allow electricity to pass through them. Materials that allow electricity to pass through them are called conductors
• Conductors conduct electric current. Since metals are good conductors of electricity, electric wires are made of metals. These electric wires act as conducting materials. So they are used to make electrical circuits.
• Some common conductors that conduct electric current are copper, silver, gold and aluminium. Copper is the most popular material used for wires.
• Sometimes we receive electric shocks because our bodies are also good conductors of electricity.
• Materials that do not allow electricity to pass through them are called insulators. Insulators oppose electric current and so they are used as protection from the dangerous effects of electricity.
• Some common insulators are glass, air, plastic, cotton, thermocol, wood and rubber.
• Water is a good conductor of electricity, but in its purest form, called distilled water, it acts as an insulator. Distilled water is, therefore, used in batteries as an insulator.
• We use various electrical appliances every day. Without the help of insulators, the use of electrical appliances is impossible. The parts of the electric appliances that we touch are covered with insulating material.
• Example: Plugs and switches are covered with an insulating material such as plastic, and the wire attached to the plug is a metal wire, which is a conductor. So conductors and insulators work hand in hand.
The document Study Notes: Electricity & Circuits | Science Class 6 is a part of the Class 6 Course Science Class 6.
All you need of Class 6 at this link: Class 6

## Science Class 6

85 videos|174 docs|37 tests

## FAQs on Study Notes: Electricity & Circuits - Science Class 6

 1. What is an electric cell?
Ans. An electric cell is a device that produces electricity by converting chemical energy into electrical energy. It has two electrodes - a positive and a negative - which are separated by an electrolyte. When the electrodes are connected by a conductor, a flow of electrons occurs from the negative electrode to the positive electrode, producing an electric current.
 2. What is an electric circuit?
Ans. An electric circuit is a path along which an electric current can flow. It consists of a source of electrical energy (such as an electric cell), conductors (such as wires), and a load (such as a bulb). The circuit must be closed for the current to flow, which means that the conductors must form a complete loop.
 3. What is an electric switch?
Ans. An electric switch is a device that can be used to open or close a circuit, thereby controlling the flow of electrical current. It typically consists of a lever or button that can be moved to make or break the connection between the two conductors in a circuit. When the switch is closed, the circuit is complete and current flows; when the switch is open, the circuit is broken and no current flows.
 4. What are electric conductors and insulators?
Ans. Electric conductors are materials that allow electricity to flow through them easily. Examples of conductors include metals such as copper and aluminum, as well as graphite and some solutions. Insulators, on the other hand, are materials that do not allow electricity to flow through them easily. Examples of insulators include rubber, plastic, glass, and air. The distinction between conductors and insulators is important in designing and using electrical circuits.
 5. How does a bulb connected to an electric cell work?
Ans. When a bulb is connected to an electric cell, the current flows from the positive terminal of the cell through the conductors and into the bulb. The bulb contains a filament that is heated by the current, causing it to glow and emit light. The current then flows out of the bulb and back to the negative terminal of the cell, completing the circuit. The brightness of the bulb depends on the amount of current flowing through it, which is determined by the voltage of the cell and the resistance of the bulb.

## Science Class 6

85 videos|174 docs|37 tests

### Up next

 Explore Courses for Class 6 exam

### Top Courses for Class 6

Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Track your progress, build streaks, highlight & save important lessons and more!
Related Searches

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

,

;