Unit 9I: Energy and electricity Section 13: b. How can we reduce the waste of energy?
Objectives
Children should learn:
that when energy is transferred the total amount of energy remains constant
to use flow diagrams to show qualitatively how energy is transferred/transformed in devices
Activities
Outcomes
Children:
Introduce the principle of the conservation of energy, using a range of examples to make the distinction between energy that is useful and energy that is dissipated and not useful. Ask pupils to draw flow diagrams,
eg Sankey-type, to show energy transfers in everyday situations,
eg home heating, transport, use of insulation.
use flow diagrams as a simple means of energy accounting
Points to note
Energy flow diagrams need not be quantitative at this stage; simply show where all the energy is transferred.
This unit is divided into sections. Each section contains a sequence of
activities with related objectives and outcomes. You can view this unit by
moving through the sections or print/download the whole unit.
