[n] a device that supplies electrical energy [n] someone who imparts energy and vitality and spirit to other people
animator, energiser, energiser, vitaliser, vitalizer
abettor, activator, actuator, animator, arouser, cajoler, coax, coaxer, encourager, firer, gadfly, galvanizer, human dynamo, impeller, inducer, inspirer, life, motivating force, motive power, mover, moving spirit, persuader, pleader, prime mover, prompter