(a(i))[1]
State the energy store of the water stored behind the dam.
(a(ii))[1]
In the equipment list, draw a ring around every item needed by a hydroelectric power station.
(b(i))[1]
State the transformer type shown in Fig. 3.1.
(b(ii))[2]
Give two reasons why high voltages are used by the power station to transmit electrical energy over long distances.
(c)[4]
State two advantages and two disadvantages of using hydroelectric power stations instead of coal-fired power stations. Do not include building or maintenance costs.