A small hydroelectric generator is installed on a fast-flowing river to provide electricity for a farm.
The decrease in mechanical energy of the water passing through the turbine is 11500 J11500\text{ J}11500 J every second. The electrical output of the generator is 16 A16\text{ A}16 A at 230 V230\text{ V}230 V.
Calculate the efficiency of the turbine and generator.
When the electrical energy generated is not immediately required, it is used to pump water up to a reservoir on a nearby hill. State the term used to describe the primary form of energy stored by the water in this reservoir.
The use of hydroelectric schemes on a large scale has environmental and economic impacts. Describe one environmental impact and one economic impact.
142 exam-style questions on CIE IGCSE Physics 1.7.3 Energy resources. Each one has a worked solution and a mark scheme showing where the marks go.