CLEAN > Teaching Climate & Energy > Teaching Energy > 1. Energy
is a Physical Quantity  Energy Principle 1. Energy is a physical
quantity that follows precise natural laws.  Jump down to:
Teaching with this principle | Find activities  Teaching this
principle is supported by 8 key concepts:  1.1 Energy is a
quantity that is transferred from system to system. Energy is
the ability of a system to do work. A system has done work if it
has exerted a force on another system over some distance. When
this happens, energy is transferred from one system to another.
At least some of the energy is also transformed from one type
into another during this process. One can keep track of how much
energy transfers into or out of a system. 1.2 The energy of a
system or object that results in its temperature is called
thermal energy. When there is a net transfer of energy from one
system to another, due to a difference in temperature, the
energy transferred is called heat. Heat transfer happens in
three ways: convection, conduc