Answer: Electric Motor Electric Motor is a device which converts electrical energy into mechanical energy. All others are measuring instruments.
Answer: Magnet All the others are devices which convert electrical energy into other forms.
Answer: Generator Generator converts mechanical energy into electrical energy. All the others can be used as safety devices.
Answer: Nichrome Nichrome is an alloy while all the others are metals.
Answer: Electric bell Electric bell works on the magnetic effect of electric current while all the others work on the heating effect of electric current.