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प्रश्न
What is the meaning of the symbol kWh? Which quantity does it represent?
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उत्तर
The symbol KWh stands for kilowatt-hour. It is the commercial unit of electrical energy.
संबंधित प्रश्न
Define Electric power.
Distinguish between kilowatt and kilowatt-hour.
Two bulbs are rated 60 W, 220 V and 60 W, 110 V respectively. Calculate the ratio of their
resistances
An electric bulb, when connected across a power supply of 220 V, consumes a power of 60 W. If the supply drops to 180 V, what will be the power consumed? If the supply is suddenly increased to 240 V, what will be the power consumed?
What is the energy conversion when an electric current passes through a metallic wire?
State two advantages of filling an inert gas in an evacuated electric filament lamp.
What is the order of current drawn by appliances connected to the ‘power circuit’ of a household?
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?
An electrical appliance is rated 1500 W, 250 V. This appliance is connected to 250 V mains. Calculate:
(i) the current drawn,
(ii) the electrical energy consumed in 60 hours,
(iii) the cost of electrical energy consumed at Rs. 2.50 per kWh.
1 kWh is equal to:
