Advertisements
Advertisements
प्रश्न
An Electric bulb is marked 100 W, 230 V. What current does it take?
Advertisements
उत्तर
Current flowing in bulb = i = `"P"/"V"`
`= 100/230 = 10/23 "A" = 0.435` A
संबंधित प्रश्न
Write the formula for electric power in terms of potential difference and current.
How much energy does a 100 W electric bulb transfer in 1 minute?
(a) 100 J
(b) 600 J
(c) 3600 J
(d) 6000 J
Distinguish between kilowatt and kilowatt-hour.
Fig . shows the essent ial features of a battery operated bell. The hammer strikes the gong when the swi tch is closed . State and explain the effect of using the following material successively to form the core.
(a) Plastic
(b) Steel
(c) Copper
If the rating of an electric bulb is 100W – 230V, Explain its meaning.
How does the heat produced by die passage of current in a metallic wire depend on the resistance of the wire.
State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.
Two resistances R1 = 4Ω and R2 = 6Ω are connected in series. The combination is connected with a battery of e.m.f. 6V and negligible resistance. Calculate:
(i) the heat produced per minute in each resistor,
(ii) the power supplied by the battery.
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 |
1 kWh = ____________
