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प्रश्न
An electric heater is rated 220 V, 550 W. Calculate the electrical energy consumed in 3 hours?
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उत्तर
Energy consumed in 3 hrs = `(550 xx 3)/1000` = 1.65 kWh
= 1.65 × 3600 = 5940 kJ.
संबंधित प्रश्न
1 kWh = ________ J
The diagram below shows a circuit containing a lamp L, a voltmeter and an ammeter,. The voltmeter reading 3 V and the ammeter reading is 0.5 A.
What is the resistance of the lamp?
What is the power of the lamp?
When an electric lamp is connected to 12 V battery, it draws a current of 0.5 A. The power of the lamp is:
(a) 0.5 W
(b) 6 W
(c) 12 W
(d) 24 W
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(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 100-watt electric bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. Calculate the energy consumed (in kWh) in the month of January.
1 mV is equal to:
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