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An Electric Bulb is Marked 100 W, 230 V. What Current Does It Take? - Physics

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प्रश्न

An Electric bulb is marked 100 W, 230 V. What current does it take?

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उत्तर

Current flowing in bulb = i = `"P"/"V"`

`= 100/230 = 10/23  "A" = 0.435` A

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पाठ 8: Electric Power and House hold Circuits - Short Numericals

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आईसीएसई Physics [English] Class 10
पाठ 8 Electric Power and House hold Circuits
Short Numericals | Q 16

संबंधित प्रश्‍न

Which one has a higher electrical resistance : a 100 watt bulb or a 60 watt bulb?


At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulb could be switched on in the house at the same time (if they are all connected in parallel)?


The table below shows the current in three different electrical appliances when connected to the 240 V mains supply: 

Appliance Current
Kettle 8.5 A
Lamp 0.4 A
toaster 4.8 A
  1. Which appliance has the greatest electrical resistance? How does the data show this?
  2. The lamp is connected to the main supply by using a thin, twin-cored cable consisting of live and natural wires. State two reasons why this cable should not be used for connecting the kettle to the mains supply.
  3. Calculate the power rating of the kettle when it is operated from the 240 V mains supply.
  4. A main takes the kettle abroad where the mains supply is 120 V. What is the current is the kettle when it is operated from the 120 V supply?

 State and define the household unit of electricity.


What do you mean by a circuit diagram?

If the rating of an electric bulb is 100W – 230V, Explain its meaning.


State relative advantages and disadvantages of ring system of wiring over the tree system.


A bulb is connected to a battery of e.m.f. 6V and internal resistance 2Ω A steady current of 0.5A flows through the bulb. Calculate the heat energy dissipated in the bulb in 10 minutes.


The resistance of filament of an electric heater is 500 Ω It is operated at 200V for 1 hour daily. Calculate the current drawn by the heater and the energy consumed in joule.


The following table gives the electrical appliances used, their power and the average time for which they are used each day in a home. Estimate the monthly electricity bill if the rate is 60 paise per unit.

Sr.no. Name Nos. Power rating  Time/day
1 Bulb 4 100 W 7.5 hr
2 Fans 2 50 W 10 hr
3 T.V. 1 100 W 2 hr
4 Iron 1 500 W 1 hr
5 Electric stove 1 750 W 2 hr

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