11. Electric Current
1. AC stands for _______________.
2. DC stands for _____________.
3. __________ is an electric discharge between two clouds or between cloud and earth.
4. The electric discharge through air appears to us as an ___________ or ___________.
5. In a battery the chemical energy is converted into _________.
6. The material which transfers energy from battery (source) to the bulb is called a __________.
7. The material which cannot transfer energy from battery (source) to the bulb is called a ____________.
8. Metals contain a large number of free electrons while the _________ are fixed in their locations.
9. The arrangement of the positive ions in a conductor is called ________.
10. The ordered motion of electrons in a conductor is called ___________.
11. __________ is defined as the amount of charge crossing any cross section of the conductor in one second.
12. Electric current, I = _______
(I= 
)13. The SI unit of electric current is _________ denoted by A.
14. 1 Ampere = __________________.
15. The electrons in the conductor move with a constant average speed. We call this speed as _______________.
16. The number of charges present in the conductor in a unit volume is called ____________.
17. The charge carriers in a conductor are __________.
18. The magnitude of electric charge ‘e’ is ___________.
19. The electron density of copper that was found experimentally is n = _________.
20. Potential difference is also called ___________.
21. The SI unit of potential difference is “______” and it is denoted by ____.
22. 1 Volt = _____________.
23. A battery consists of two metal plates called electrodes and a ___________.
24. The electrolyte (chemical) between the two metal plates consists of ___________ and _________ ions which move in opposite directions.
25. W/q is the work done by the chemical force on unit negative charge to move it from positive terminal to negative terminal. This is called _________.
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