How does an electric bulb produce light Class 7?

Answer: When electric current passes through objects such as the filament of an electric bulb, the filament glows and produces light. Here, electrical energy is converted into light energy. This is the lighting effect of electric current.

How does an electric bulb produces light?

An incandescent bulb works on the principle of incandescence, a general term meaning light produced by heat. In an incandescent type of bulb, an electric current is passed through a thin metal filament, heating the filament until it glows and produces light.

How does an electric bulb work Class 7?

(c) The electric bulb contains a very thin wire called filament to conduct electricity. When an electric current flows through the bulb, the bulb glows and the filament carrying current gets heated. This happens due to the heating effect of electric current.

What is an electric bulb class 7th?

The electric bulb (incandescent bulb) consists of a globe, the filament, connecting wires and a stem, a base and inert gases filled within it. The thin wire present inside the light bulb is named as the filament of the bulb. It is made of tungsten.

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How does a light bulb produce light Class 6?

When the two ends of a cell are connected to a bulb using metal wires, the bulb emits light. The bulb glows due to flow of electric current from the positive terminal to the negative terminal through the filament of the bulb. Such a circuit is called a closed circuit.

Why does an electric bulb glow?

The typical incandescent light bulb contains a thin wire (usually tungsten) called a filament that has a high electrical resistance. This filament gets very hot when an electric current passes through it. The intense temperature makes the filament glow brightly.

Why is electric light important?

The electric light bulb has been called the most important invention since man-made fire. The light bulb helped to establish social order after sundown, extended the workday well into the night, and allowed us to navigate and travel safely in the dark. Without the light bulb, there would be no nightlife.

What are the causes of fire in electric circuit class 7?


  • faulty outlets,appliances.
  • light fixtures .
  • Extension cords.
  • Space heaters.
  • Wiring.

Does an electric bell has an electromagnet?

An electric bell consists of one or more electromagnets, made of a coil of insulated wire around an iron bar, which attract an iron strip armature with a clapper.

Why are electric fuses important in Class 7?

A fuse is a safety device which limits current in circuit as a result it prevents damages to electrical circuits and possible fires. Fuses used in electrical appliances. In order to make a battery the negative terminal of one cell is connected to the positive terminal of the other cell.

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What is an electromagnet Class 7?

Answer: An electromagnet is a coil of insulated wire wound around a piece of a magnetic substance such as soft iron. The magnetic substance acts as a magnet as long as the current flows in the wire.

Which effect of electric current is used to make an electric bell?

heating effect of electric current is utilised in an electric bell.

Which one is not part of electric bell?

The bulb is not a component electric bell.

Will the bulb glow in the circuit?

Yes, the bulb would glow in the given circuit because the circuit is closed or complete.

Why do bulb has two terminals Class 6?

ANSWER ➡ The bulbs have two terminals because, a circuit can be completed only when there are both the positive terminal as well as negative terminal, as the current flow is allowed only when the circuit is complete. Hence, the bulb has two terminals.

What is a switch Class 6?

Electric Switch is an electrical device which can make or break an electric circuit. A switch is said to be in ‘ON’ position when it makes or completes the circuit and allows the current to pass through. Similarly, a switch is in ‘OFF’ position when it breaks the circuit and does not allow the current to pass through.

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