Answer : There are many ways to use electric current, but as you have asked for only three, here are some of them along with the change in their energy transformations;
1) Using a light bulb which consumes electrical energy and the energy is transformed into light energy, making everything visible for us.
2) Using a power tool makes use of electrical energy and the energy is transformed into mechanical energy for multipurpose use of cutting woods.
3) Using electrical iron converts electrical energy into thermal energy to heat the iron and enables the user to iron crease-free clothes.