State the type of transformation of energy in the case of a light bulb.
name the commercial unit of energy . establish a relationship b/w this unit and S.I unit of energy .
a battery lights a torch bulb .state the energy transformation envolved in this process
Identify and state the type of transformation of energy in the following cases:
1. When coal is burnt.
2. When a dry cell discharges.
3. In a thermal power plant.