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CBSE Class 10 Answered

Explain the basic principle underlying in the emission of light by electric bulb and why a cfl bulb is better than a normal electric bulb?
Asked by nimishagupta0409 | 24 Jun, 2015, 11:08: AM
answered-by-expert Expert Answer
Heating effect of electric current is utilized in electrcial (incandescent) bulbs. When electric current is passed through the tungsten filament in the bulb, it becomes white hot and glows. Due to this light is emmited.
CFL (Compact Flouroscent Lamps) consist of a unit of electronic circuit and a flouroscent tube filled with mercury vapour. High frequency electricty is supplied between the electrodes of the tube with the help of the elctronic circuit. Due to this the filament attached with the cathode heats up and electrons are emitted. The fast moving electrons collide with the atoms of mercury vapour filled in the tube and emit invisible ultraviolet rays. The fluorescent coating inside the tube converts the ultraviolet rays and emits visible light. Thus, the tube glows.

Benefits of CFL bulbs:
  1. Save's energy.
  2. It emits more intense light.
  3. Majority of energy used in converted into light energy
  4. Lifespan of fluorescent lamps is about 5 times than that of the incandescent lamps.
Answered by Yashvanti Jain | 15 Dec, 2017, 07:12: PM

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CBSE 10 - Physics
Pls answer fast... In a resistive circuit, if the current is increased to two times the percentage change in the amount of heat dissipated in the circuit would be a) 400% b) 300% c) 200% d) 100%
Asked by anubhutiupadhaya | 04 Mar, 2023, 03:16: PM
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CBSE 10 - Physics
Two wires of copper have the same length but cross-sectional area in the ratio of 3:1. The resistance of the thicker wire is 12 ohm. (a) Calculate the resistance of the thinner wire. (b) Find the equivalent resistance of both these wires, when they are connected (1) in series (ii) parallel (c) If both the wires are connected in parallel to a battery of 24 volt, then find out the ratio of heat produced in the thicker wire to the thinner wire identify the wire if both of them are connected to the same source for the same time duration.
Asked by swetalinasamantaray022 | 20 Jan, 2023, 10:54: AM
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CBSE 10 - Physics
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Asked by hemaborate26 | 27 Apr, 2021, 03:42: PM
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CBSE 10 - Physics
state joule laws of heating
Asked by mr.bhaveshsadana | 26 Mar, 2021, 01:07: PM
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CBSE 10 - Physics
the electric heater is rated at 2 kilowatt electrical energy cost 4 rupees per kilowatt hour what is the cost of using the heater of 3 hours
Asked by 86047357aa | 07 Feb, 2021, 10:00: PM
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CBSE 10 - Physics
Write joules law of heating
Asked by gmsaivenkat | 06 Dec, 2020, 09:08: PM
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Asked by vermakkajal330 | 17 Jul, 2020, 04:16: PM
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CBSE 10 - Physics
An electric bulb draws a current of 8A and works on 250 volt on the average 8 hours a day find the power consumed by co. consumed by the bulb and find if the electric distribution company is the meaning
Asked by nannappa951 | 11 Jul, 2020, 12:22: PM
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CBSE 10 - Physics
Q8. An electric bulb is marked 18watt-240 volt. If it is used across 240 V power line for one hour daily, calculate the number of days to consume 1 unit of electric energy.  
Asked by Khekaleaarya | 07 Jul, 2020, 08:35: PM
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CBSE 10 - Physics
A electric rerfrigerator rated 400 watt generator 8hour/day.what is th cost of energy to operate it for 30 days at rs.3.00 per kwh  
Asked by himanglodhi2 | 12 May, 2020, 09:52: AM
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