Just as chemical energy is changed into electrical energy in a toy car, and electrical energy is changed into chemical energy when a battery is recharged, so mass can be transformed into heat energy and energy of motion and radiant energy, such as that in light, can be transformed into the form of energy we call mass.
(we; call; mass) (electrical energy; is changed; into chemical energy) (a battery; is recharged; )
we electrical energy a battery
call is changed is recharged
mass
into chemical energy