A family uses 8kW of power. Direct solar energy is incident on the horizontal surface at an average rate of 200W per square meter.If 20% of this energy can be converted to useful electrical energy,how large an area is needed to supply 8kW ?

A family uses 8kW of power. (a) Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square metre. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8kW? (a) Compare this area to that of the roof of a typical house.

A large family uses 8KW of power. Direct solar energy is incident on the horizontal surface at an average rate of 200Wm^-2 . If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8kW ?

Ram used to live in a remote village of Rajasthan which didn’t have electricity. He was a good student and studied very hard to become an engineer in spite of all hardships. While studying, he came to know that solar energy can be converted to electrical energy by using specially designed devices. He went to his village and discussed it with villagers. He also told them that Govt. also gives subsidy for using solar devices. All the villagers agreed and they contacted the Govt. officials who obliged their request and the village became the model village which used solar energy for electricity. (ii) If direct solar energy is incident on the horizontal surface at an average rate of 200 watt per square metre and 20% of this energy can be converted to use electrical energy, then how much area is needed to supply 8 KW of electrical energy?

Water falling from a 50m high fall is to be used for generating electric energy. If 8xx10^5kg in water falls per hour and half the gravitational potential energy can be converted into electric energy, how many 100W lamps can be lit?

Ram used to live in a remote village of Rajasthan which didn’t have electricity. He was a good student and studied very hard to become an engineer in spite of all hardships. While studying, he came to know that solar energy can be converted to electrical energy by using specially designed devices. He went to his village and discussed it with villagers. He also told them that Govt. also gives subsidy for using solar devices. All the villagers agreed and they contacted the Govt. officials who obliged their request and the village became the model village which used solar energy for electricity. (iii) Why is solar energy a batter source of energy?

A carnot engine has an efficiency of 20%. The energy is supplied to the engine at the rateof 2kW . What is the output power of the engine?

Water falling from a 50m high fall is to be used for generating electric power. If 1.8xx10^(5)kg of water falls per hour and half the gravitational potential energy can be converted into electric energy, how many 100 watt lamps can be lit ?