Fill in the blanks.
1. Hydel electricity is produced in _____ in Tirunelveli district.
2. In Thermal power station _____ is used as fuel.
3. _____ Cells used in automobiles like cars and buses are large and very heavy.
4. The rate of flow of electric charges in a circuit is called ______
5. ______ is a kind of fish which is able to produce electric current.
6. ______ are used to connect devices.
7. _____ was an American inventor, who invented electric bulb.
