Fig. 4.1 shows a flow diagram for the energy transferred in a television.
(a) (i) State two ways in which useful energy is transferred from the television.
(ii) Determine the value of the wasted energy output from the television.
(b) Fig. 4.2 represents a hydroelectric power station.
(i) Describe how a hydroelectric power station generates electrical power.
(ii) Apart from cost, state one advantage and one disadvantage of generating electrical power using a hydroelectric power station compared to a coal-fired power station.
Most-appropriate topic codes (Cambridge IGCSE Physics 0625):
• Topic 1.7.1 — Energy (Parts (a)(i), (a)(ii))
• Topic 1.7.3 — Energy resources (Parts (b)(i), (b)(ii))
