Advertisements
Advertisements
Question
State two advantages and two disadvantages of using hydro-energy for producing electricity.
Advertisements
Solution
Advantages:
(i) When electricity is generated, no greenhouse gases are made.
(ii) It is an inexhaustible source of energy.
Disadvantages:
(i) The dam is expensive to build.
(ii) By building a dam, the nearby area has to be flooded and this could affect nearby wildlife and Plants.
RELATED QUESTIONS
Name the process used for producing electricity using nuclear energy.
Fill in the blank
An object falling freely from the roof of a multistorey building has ________ and _________ energy when halfway down the building.
Two toy-cars A and B of masses 500 g and 200 g respectively are moving with the same speed. Which of the two has the greater kinetic energy?
A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the ground.
Name the type of energy (kinetic energy K or potential energy U) possessed in the given case:
A stretched wire
What is meant by the renewable and non-renewable sources of energy? Distinguish between them giving two examples of weach.
How is the solar energy used to generate electricity in a solar power plant?
A hydroelectric power station takes its water from a lake whose water level is 50 m above the turbine. Assuming an overall efficiency of 40%, calculate the mass of water which must flow through the turbine each second to produce power output of 1 MW. (Take g = 10 m s−2).
State the energy changes which take place when:
In a heat engine.
Unit of calorific value of a substance is ____________.
