Grade 8 Technology (TECH) Summaries Term 4 (Via Afrika): These summaries are compiled using the Via Afrika textbook's Term 4 content. The summaries are in English, with additional notes provided by the compiler.
Unit 1: Electrical systems and control: design skills
Unit 2: Impact of t...
, Thermal power stations
• Turbines rotate to provide mechanical energy which is used to
generate electrical energy by the generator.
Wind-driven turbines • Boiling water creates steam - compressing the steam produces
energy to rotate the turbine.
• Converts wind (kinetic energy) into electrical • Thermal power stations = power stations that use steam
energy. turbines to produce electricity.
• Wind turbine blades spin - generate electrical
energy.
• The blades are attached to the hub, connected
to the shaft.
• The shaft connects to the gearbox transmission
Sample
- increases the blade rotation speed.
• The gearbox is connected to a high-speed shaft
- turns the generator and produces electricity.
U4: Electrical
systems and
control: impact
Nuclear energy
• Nuclear fission = the process where uranium atoms
are split, releasing energy in the form of heat.
• The high-temperature steam from generators
of technology (A) drives turbines, generating electricity.
Summaries after sample
• Steam from steam generators is channelled to
condensers - cools and condenses the steam into
Hydroelectric power stations water.
• Utilises running water energy for electrical energy -
production.
• Stations are typically built on dams, rivers or near
waterfalls.
Solar energy
• Water flow can be controlled via gates or pipes.
• Solar panels capture the sun's energy which charges
• High water levels from dam walls increase pressure
a battery.
in pipes for turbine operation.
• Energy stored in the battery can be used to heat
water in geysers or for lights in homes.
• Solar irradiance -> solar panel -> battery charger
controller -> battery -> DC loads.
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller SummariesSA. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.67. You're not tied to anything after your purchase.
