A light bulb converts electricity into light. You and I know that the light does not run through the cord, but a child might. Heat is used in nuclear power plants to produce electricity. Electrical energy is changed into heat in a hotplate. Blenders, mixers, lawn mowers convert that same electrical energy into mechanical motion.
CD players convert electrical impulse into Sound.
Plants convert the energy of the sun into chemicals. Message impulses to the brain are converted. What we see is not really what we see. If nerve fibers from our eyes were crossed with the nerve fibers from our ears, we could hear color and see sounds. Human retinas process three types of cones which are sensitive respectively to three basic wavelengths, the wavelengths we interpret as red, blue, and green, the primary colors for light as on a TV screen.