preface - Lehrpersonen.ch
preface - Lehrpersonen.ch
preface - Lehrpersonen.ch
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FIELD TRIP TO AMANI IN TANGA<br />
A STUDY OF HYDRO-ELECTRIC POWER<br />
Suitable for Paper 1/2 (0460/1/2)<br />
Hydro- electric power is electricity produced by the power of falling water. Water from a<br />
reservoir or lake drops towards the water turbine through a long pipe called a penstock.<br />
The water turbine <strong>ch</strong>anges the energy of movement (kinetic energy) into energy in the<br />
form of me<strong>ch</strong>anical power (me<strong>ch</strong>anical energy).<br />
The distance the water falls before it strikes the water turbine is called the 'head'.<br />
There are three types of water turbine:<br />
. The Pelton wheel-used with 'heads' of more than 300metres.<br />
. The Francis turbine-used with 'heads' of between 30 and 300metres.<br />
. The Kaplan turbine-used with 'heads' of less than 30metres.<br />
The movable gates called guide vanes or nozzles aim the falling water at the blades or<br />
buckets. The blades are pushed hence turning the wheel and the axle whi<strong>ch</strong> is mounted<br />
vertically or horizontally. The axle is directly or indirectly connected to a ma<strong>ch</strong>ine, an<br />
electric generator or a dynamo.<br />
41<br />
2006 © Laureate International S<strong>ch</strong>ool<br />
The Kaplan turbine
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