Electric bulb was invented by

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The electric bulb was invented by Thomas Edison in 1879. He created a bulb with a filament made of carbonized bamboo that could burn for over 1000 hours. This invention greatly improved upon earlier versions of the light bulb and greatly contributed to the widespread use of electric lighting. Edison's bulb design helped lay the foundation for the modern electrical power system.

The electric bulb was invented to provide a more efficient and practical source of artificial light compared to existing sources such as candles, oil lamps, and gas lights. The invention of the electric bulb revolutionized the way people lived, worked, and communicated and had a profound impact on the modern world. A bulb is made up of 3 parts: filament, glass, and base.

Thomas Edison

Thomas Edison

Uses of Electronic Bulb

Some of the major uses of electronic bulbs are as follows: 

  • It's found in automotive headlights and vehicle lights.

  • It's utilized in table lamps and other portable illumination.
  • It's utilized for both residential and commercial lighting.
  • It's utilized in advertising and decorative lighting.
Important Questions on Current Electricity
  1. A stone of mass 5 kg falls from the top of a cliff 50 m high and… 
  2. A galvanometer with resistance 100 Ω gives full scale deflection with a current of 10 mA… 
  3. An electric current of 3 A passes through a wire of resistance 15 Ohm. How much heat will be developed in 1 minute?
  4. Two copper wires, one of length 1 m and the other of length 9 m, are found to have the same resistance… 
  5. If a wire of resistance R = 10ohm is stretched to double of its length, then new resistance will be:
  6. An AC voltage source of variable angular frequency ωand fixed amplitude… 
  7. Find out the following in the electric circuit given in Figure (a) Effective resistance of two 8 Ω resistors in the combination
  8. The resistance if a wire is 'R' ohm. If it is melted and stretched to 'n' times its original length, its new resistance will be:
  9. A galvanometer has a resistance of 3663 ω. A shunt S is connected across it such that… 
  10. An inductor of inductance L= 400mH and resistors R1=2Ω and R2=2Ω are connected to…
  11. Why are alloys used for making standard resistance coils?
  12. What is inductive resistance formula?
  13. Who invented Electricity?

Also Read:

CBSE CLASS XII Related Questions

  • 1.

    A parallel beam of monochromatic light falls normally on a single slit of width $a$ and a diffraction pattern is observed on a screen placed at distance $D$ from the slit. Explain:

    (I) the formation of maxima and minima in the diffraction pattern, and

    (II) why the maxima go on becoming weaker and weaker with its increasing number $n$.


      • 2.
        A current of \(4.0\,\text{A}\) flows through a wire of length \(1\,\text{m}\) and cross-sectional area \(1.0\,\text{mm}^2\), when a potential difference of \(2\,\text{V}\) is applied across its ends. Calculate the resistivity of the material of the wire.


          • 3.
            In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

              • \(10\ \text{N/C}\) along \(+x\)
              • \(10\ \text{N/C}\) along \(-x\)
              • \(50\ \text{N/C}\) along \(+x\)
              • \(50\ \text{N/C}\) along \(-x\)

            • 4.
              Draw the plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions that can be drawn from this plot.


                • 5.

                  Find the ratio $\dfrac{\lambda_\alpha}{\lambda_p}$ of the de Broglie wavelength $\lambda_\alpha$ associated with an alpha particle to the de Broglie wavelength $\lambda_p$ associated with a proton if both are moving with the same velocity.


                    • 6.

                      A magnet held vertically, with its north pole down, is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,

                        • the induced current will flow in the anticlockwise direction.
                        • the induced current will flow in the clockwise direction.
                        • no induced current will flow in the solenoid.
                        • the magnet will fall with a constant velocity.
                      CBSE CLASS XII Previous Year Papers

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