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Lesson: Electricity Transmission Networks Physics

In this lesson, we will learn how to describe how national electricity grids work and how they respond to changes in demand.

Lesson Plan

Students will be able to

understand what causes changes in demand for electricity over the course of a day and over the course of a year,
understand that some power stations are kept below maximum operating power so that they can speed up quickly if the demand suddenly increases,
understand how quickly or slowly a power station can start up or turn off for the different main types of power stations: coal-fired, gas-fired, nuclear, and hydroelectric dam,
understand that when the electrical power is transmitted across electricity networks, it is transmitted at a high voltage and a low current.

Lesson Video

Lesson Playlist

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02:29
04:53

Lesson Worksheet

Q1:

What type of device can be used to increase the potential difference of electricity supplied to the national grid so as to increase the power transmitted while reducing energy lost to the surrounding environment?

Q2:

The national grid transmits electrical power at a very high potential difference and a very low current. Why is this?

Q3:

A nuclear power station in the UK develops a fault and needs to be shut down quickly so that it can be repaired. Which of the following types of power station could be quickly turned on to compensate for the supply lost by the nuclear power station shutting down?