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.
    This ‘average velocity’ is found be few mm/s for currents in range of a few amperes. How then is current established almost the instant a circuit is closed ?


      • 2.
        Capacitors are manufactured with certain standard capacitances and working voltages. However, these standard values may not be the ones that are actually needed in a particular application. Two or more capacitors can be grouped in series or in parallel to achieve desired capacitance and voltage. When connected in series, the total capacitance decreases while the voltage rating increases, whereas in parallel connections, the total capacitance increases and maintains the same voltage rating. A capacitor stores energy in the electric field between its plates and stored energy is proportional to the square of the voltage and capacitance $U = \frac{1}{2}CV^2$, where symbols have their usual meanings.
        Two capacitors, one of $3 \ \mu$F and the other of $6 \ \mu$F, are connected in series in the circuit as shown in the figure, for a long time. }


          • 3.
            The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.


              • 4.
                Write two advantages of reflecting telescope over refracting telescope.


                  • 5.
                    A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.


                      • 6.
                        Read the following paragraph and answer the questions that follow.
                        A p-type or n-type semiconductor can be converted into a p-n junction by doping it with suitable impurity. The motion of majority charge carriers causes diffusion current across the junction while the barrier electric field causes motion of minority carriers for drift current. In case of unbiased diode, the diffusion and drift currents are equal. This equilibrium is disturbed by the biasing batteries. Diodes, therefore, allow currents in one direction. This property of diode is used in making rectifiers.

                          CBSE CLASS XII Previous Year Papers

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