Generation and transmission of electricity

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The generation, transmission, and use of electricity play a vital role in modern life. Electromagnetic induction is used to generate electricity. Electricity is generated through electromagnetic induction, a process that produces either alternating current (AC) or direct current (DC), depending on the circuit design. Physicists and engineering can use Faraday’s law to determine the magnitude of the induced current, and Lenz’s law indicates its direction.

Once generated, electricity must be transmitted efficiently to consumers with minimal power loss. To achieve this, transformers are used to increase (step up) the voltage before transmission through power lines. Higher voltage reduces energy loss caused by the resistance of transmission wires. At the destination, transformers decrease (step down) the voltage to safe and usable levels for homes and businesses, such as converting 240V mains power to the appropriate voltage for household appliances.

This resource revises the generation and transmission of electricity and within this topic there are 3 key concepts:

To determine if this resource will benefit you, start by answering the following questions.

  • How is electricity generated at a power plant?
  • What is an alternator?
  • How is electricity transmitted to houses and workplaces?

The answers to these questions are provided on the following pages. Use this resource to refresh your memory, reinforce your understanding of these concepts, and prepare more effectively for university-level learning.