Q41 of 269 Page 142

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

The electricity that is produced by the solar cells during the day time is stored in the rechargeable batteries so that the produced electricity can be used later on, for instance, at night.


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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?

 40

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

 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.

 42

What difference would you expect in the charging of car battries

(i) in bright sunlight


(ii) on a cloudy day


(iii) at night?