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investigating the relationship between the diameter and the current in a wire at its melting point
- Words:
- 1678
- Submitted:
- Thu Mar 05 2009
- Mark submitted by Author:
Have a little read: ... Investigation Report Aim - Theory - When current is passed through a wire resistance is created. This resistance is depends on the resistivity of the wire, current, voltage, wire length and cross-sectional area. So... R = ? . l A R = Resistance. P = Resistivity. L = Length. A = Cross sectional area. (Pg. 200, Accessible Physics, 1995, MacMillan Press ,ISBN 0333-627-80-6) (Pg. 47, Advanced Physics Revision Handbook, 1996, Oxford University Press, ISBN 0-19-914640-3) Looking for a formula for resistance - R = ? . l ( Resistance is the product of resistivity and length A per unit cross sectional area.) R = Resistance. P = Resistivity. L = Length. A = Cross sectional area. (http://physics.bu.edu/~duffy/PY106/Resistance.html) Looking for a formula for voltage - V = I . R (Voltage is the product of current and resistance) V = Voltage I = Current R = Resistance (http://www.allaboutcircuits.com/vol_1/chpt_2/1.html) Looking for a formula for Cross sectional area - A = ?r2 (Cross sectional area is the product of pie and radius squared) Or. A
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