Some insulators, such as quartz, change their shape when subject to an electric field. Electro-thermal, linear expansion. All materials expand when heated. Electro-thermal, differential expansion. Bimetal, heated electrically, bends.
Electric heat boils water and the resulting steam, under pressure, does mechanical work.
Electro-thermal, electron beam. Electrical heat causes electrons to boil out of a solid and electrostatic force accellerates the electrons. Most explosives are detonated by the heat from an electric current in a fine wire inside the explosive. Electro-thermal, fusible link. Electric current melts the link and releases the energy in a spring.