Advertisements
Advertisements
प्रश्न
Define 1 kilowatt hour.
उत्तर
Kilowatt hour
1 Kilowatt hour is the energy consumed when 1 kilowatt of power is used for 1 hour
1 kwh = `1000 "watt" xx 36000 "second"`
= `3.6 xx 10^6` watt second
= `3.6 xx 10^6` Joule (J)
APPEARS IN
संबंधित प्रश्न
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be ______.
A bulb is rated as 250 V; 0.4 A. Find its : (i) power, and (ii) resistance.
The commercial unit of energy is :
(a) watt
(b) watt-hour
(c) kilowatt-hour
(d) kilo-joule
An electric bulb is rated ‘100 W, 250 V’. What information does this convey?
A bulb marked 12 V, 24 W operated on a 12 volt battery for 20 minutes. Calculate:
(i) the current flowing through it, and
(ii) the energy consumed
A bulb with rating 250 V, 100 W is connected to a power supply of 220 V situated 10 m away using a copper wire of area of cross-section 5 mm2. How much power will be consumed by the connecting wires? Resistivity of copper = 1.7 × 10−8 Ωm
What is the current I in the given circuit (Fig. )?
What is electric power? State and define its S.I. unit.
1 kWh = ____________
A student wants to use an electric heater, an electric bulb and an electric fan simultaneously.
How should these gadgets be connected with the mains? Justify your answer giving three reasons.