❐the amount of energy transferred from the
mains is measured in kilowatt-hours, called Units
❐energy transferred = power x time
(kWh) (kW) (h)
❐the cost of the energy can be calculated using
total cost = number of Units x cost per Unit
Light action
Pupil Research Brief
Introduction
Since 1993 the Schools and Homes Energy Education
Project (SHEEP) has been conducting research into
ways that schools can make informed decisions for
sustainable energy use. SHEEP has designed and
UPIL
ESEARCHER
NITIATIVE
I
RP
Route through the Brief
Syllabus Coverage Subject Knowledge and Understanding
Teachers’ Notes
❐ whenever energy is transferred to where it is
wanted and in the form it is wanted (usefully
transferred) the rest is transferred in some non-
useful way and so is wasted.
❐the fraction of the energy supplied to a device
which is usefully transferred is called the
efficiency of the device
❐ when supplied with appropriate information
you should be able to evaluate methods of
reducing wasteful transfers of energy
