What is electric resistance How is it used in an electric bulb Class 7?

Electricity flows through a thin tungsten wire in the light bulb called the filament. The filament used in a bulb has a property called “resistance.” Resistance is the amount of friction that an object will put against electricity flowing through it. A filament has a lot of resistance to electricity.

What is the resistance of an electric bulb?

The filament of a light bulb is an extremely thin wire. This thin wire resists the flow of electrons. You can calculate the resistance of the wire with the resistance equation. So the resistance is 120 ohms.

What is resistance BYJU’s?

Resistance is the measure of opposition applied by any object to the flow of electric current. A resistor is an electronic constituent that is used in the circuit with the purpose of offering that specific amount of resistance. … Resistance is measured in ohms (Ω).

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.

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What is an electric bulb short answer?

An electric bulb refers to an electric lamp which consists of a translucent or transparent glass housing. It is also known as a light bulb. This simple device has been used for the purpose of illumination for more than a century. Electric bulb refers to a device which produces light on the application of electricity.

What is the resistance of a 12v bulb?

Each incandescent bulb (12-volt/system) measures 1.5 ohms with a meter; however, there is no resistance across the LED [replacement] bulbs.

What is the resistance of a 12v 5w bulb?

I think that the resistors that are shown in the original link are for side light bulbs which are 5w, which at 12v give a resistance of approx 30 ohms.

What is the example of resistance?

The act or an instance of resisting or the capacity to resist. Resistance is defined as a refusal to give in or to something that slows down or prevents something. An example of resistance is a child fighting against her kidnapper. An example of resistance is wind against the wings of a plane.

What is called resistance?

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). Ohms are named after Georg Simon Ohm (1784-1854), a German physicist who studied the relationship between voltage, current and resistance.

What is resistance and its formula?

Resistance has units of ohms (Ω), related to volts and amperes by 1 Ω = 1 V/A. There is a voltage or IR drop across a resistor, caused by the current flowing through it, given by V = IR.

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What is the purpose of using an electric bulb?

A light-bulb produces light from electricity. In addition to lighting a dark space, they can be used to show an electronic device is on, to direct traffic, for heat, and for many other purposes. Billions are in use, some even in outer space. Early people used candles and oil lamps for light.

What is the function of an electric bulb?

A bulb converts electrical energy to light. When electric current flows through it, the bulb produces light. A switch stops and allows the electricity to flow through the circuit.

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


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