SYSTEM - object or group of objects
Energy is transferred when a system changes
CLOSED SYSTEM - when matter or energy can't leave the systems so the net change of energy is 0.
The total amount of energy in the closed system is CONSTANT
How does energy transfer?
-HEAT e.g. boiling water in kettle, the water = system. the energy is transferred by heating into the waters internal store- electric to thermal energy
-DOING WORK work done = energy transfer
The work can be done if a current flows or there is a force moving the object
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