Hwange Power Plant. Image credit chronicle.co.zw

Hwange Power Plant. Image credit chronicle.co.zw

ZIMSEC O Level Combined Science Notes: Introduction:Motors and generators

  • Due to their nature batteries and cells produce a limited amount of electrical power
  • A lot of the electricity used in homes and industries comes from generators
  • Generators convert kinetic energy into electrical energy
  • There are various types of generators
  • For example:
  • At Kariba water is used to turn turbines which produces the motion required to produce electricity
  • At Hwange thermal energy from coal is used to produce steam which turns the turbines
  • At Koeberg Nuclear Power Station in South Africa nuclear power produces steam to power turbines
  • Geothermal power is also used to generate electricity
  • Wind is used to turn turbines and produce electricity
  • Petrol and Diesel generators burn fuel to generate electricity
  • The generation of electrical energy from kinetic energy is a result of electromagnetic induction
  • When the turbines are turned in all these cases
  • They rotate a coil of conducting wire in a magnetic field
  • This movement of the coil inside a magnetic field makes current flow inside the coil
  • Electric Motors convert electrical energy into kinetic energy
  • They are found in various household and industrial devices
  • For example grinding mills, fridge compressors, cars etc

To access more topics go to the Combined Science Notes page.


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