∆Wind mill:-Wind energy to electrical energy.
∆Radio :-electrical energy to sound energy.
∆Water heater :-Electrical energy to heat energy.
∆solar bike:- Solar energy to mechanical energy.
∆Hydroelectric dam:-Hydro energy to electrical energy.
∆Bulb:- Electrical energy to light energy and heat energy.
∆Burning of coal:-potential energy to fuel energy or mechanical energy.
∆kettle:- Electrical energy to heat energy.
∆ Iron box:- Electrical energy to heat energy.
∆Solar heater:- solar energy to heat energy.
Hope it helps you...