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प्रश्न
An electric bulb is rated ‘100 W, 250 V’. What information does this convey?
उत्तर
It means that if the bulb is lighted on a 250 V supply, it consumes 100 W electrical power, (which means 100 J of electrical energy is converted in the filament of the bulb into light and heat energy in 1 second).
संबंधित प्रश्न
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Which of the following is likely to be the correct wattage for an electric iron used in our homes?
(a) 60 W
(b) 250 W
(c) 850 W
(d) 2000 W
Name three main characteristics of an heating element.
If the rating of an electric bulb is 100W – 230V, Explain its meaning.
State the reason why, in a three pin plug, the earth pin is longer and thicker than the other two.
An Electric bulb is marked 100 W, 230 V. What current does it take?
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.
A bulb is marked 100W, 220V and an electric heater is marked 2000 W, 220 V.
(i) What is the ratio between the resistances of these two devices?
(ii) How does the power-voltage rating of a device help us to decide about the type of leads (connecting wires) to be used for it?
(iii) In which of the above two devices, a thicker connecting wire of lead is required?
A consumer uses 4 lamps of 60 watt, 2 lamps of 40 watt, and 2 lamps of 100 watt. All these are used for 6 hour daily. Find the total bill for 30 days when the rate of energy is 75 paise per unit and the meter rent is Rs. 1.
