Advertisements
Advertisements
प्रश्न
What does the unit kilowatt hour measure? Define it.
What does the unit kilowatt hour measure?
Advertisements
उत्तर
The unit kilowatt-hour measures electrical energy. 1 kWh is the electrical energy consumed by an electric appliance of power 1 kW when it is used for 1 hour.
APPEARS IN
संबंधित प्रश्न
Write the formula for electric power in terms of potential difference and current.
At a given time, a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulb could be switched on in the house at the same time (if they are all connected in parallel)?
A geyser is rated 1500 W, 250 V. This geyer is connected to 250 V mains. Calculate:
(i) the current drawn
(ii) the energy consumed in 50 hours, and
(iii) the cost of energy consumed at Rs. 4.20 per kWh
What is the energy conversion when an electric current passes through a metallic wire?
Why is a concave reflector placed behind the heating element in a room heater.
Give two precautious that you would take while putting off an electric switch.
An electric kettle is rated 3kW, 250V. What should be the current capacity of the fuse with it?
How can electric energy consumed by an electric appliance be calculated in kilowatt hour (kWh)?
What is the commercial unit of electrical energy? Represent it in terms of joules.
A family uses 8 kW of power. Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW?
