Q40 of 269 Page 142

In a solar water heater, why is the storage tank placed at a higher level than the solar panel containing coils?

In a solar water heater, the storage tank placed at a higher level than the solar panel containing coils because hot water, being lighter and less denser, rises to the top.


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38

A solar cooker may not cook food if :

 39

A large coal-fired power station producers 2000 MW of electrical energy. A wind turbine with 33 m blades can produces 300 kW.

(a) How many turbines would be needed to replace the power station?


(b) Why, in actual practice, this number of turbines could not replace the coal-fired power station?

 41

In many applications, solar cells are connected to rechargeable batteries. Why is this so?

 42

Solar cells are used to provide the electric current to charge the batteries of a car driven by an electric motor. Describe the energy changes which take place.