1. Define electric current: _________________________________________________________________________________________________________________

2. Electric current in a metal is due to the ___________________________Electric current in an electrolyte is due to the ________________________

3. Define:Conventional current: __________________________________________________________________________________________________________________Electron flow: ________________________________________________________________________________________________________________________

4. Charge = ___________ x ____________ ( _____ = ______) ( ) ( ) ( )

5. Define coulomb: ______________________________________________________________________________________________________________________

6. Describe how an ammeter may be used to measure the current in a circuit__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

7. Elementary charge ( ) = ___________________8. Describe Kirchhoff’s first law

__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

9. State what is meant by the term mean drift velocity of charge carriers____________________________________________________________________________________________________________________________________

10. Equation for drift velocity (define the variables)______________________________________________________________________________________________________________________________________________________________________________________________________

11. Describe the difference between conductors, semiconductors and insulators in terms of the number density, n________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

12. Define potential difference____________________________________________________________________________________________________________________________________

13. Equation for potential difference:

potential difference = = =

Symbols:Units:14. Describe how a voltmeter may be used to determine the p.d. across the

component______________________________________________________________________________________________________________________________________________________________________________________________________

15. Define electromotive force (e.m.f.)______________________________________________________________________________________________________________________________________________________________________________________________________

16. Define volt____________________________________________________________________________________________________________________________________

17. Equation for e.m.f. e.m.f. =

Units:18. Describe the difference between e.m.f. and p.d. in terms of energy transfer

________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

19.