B) Resistance (__________) – Symbol - _________
1) R = _________ (equation)
I - _________________ (amperes)
2) The resistance in a wire depends on:
a) Resistivity - R - - metals _____________________________ to electron flow
b) ___________________ (_________) of the wire
c) ___________________________) of the wire
Resistance of a wire = RL
(meters) / A (m2)
3) Resistance and Temperature
Metals – When temperature ______________, resistance _________
· Nonmetals – When temperature _______________________,, resistance ________________
· Superconductor - conductor with ________________________
Resistance in a wire
1) What is the resistance of .30 m length of copper wire that has a cross-sectional area of 5.0 x 10-5 m2?
a) How could you alter the dimensions of this wire to reduce the resistance?
To reduce the resistance in a wire you could __________________
2) If the length of a wire were halved, how would that change the wires resistance?
3) Which material on your reference table would produce a wire that would allow current to flow the best?