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What is electrical resistance?

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Resistance (Applet)

Allows various configerations of resistances to be put together and their total resistance calculated.

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http://lectureonline.cl.msu.edu/~mmp/kap20/RR506a.htm

Resistance

The electrical resistance of a material is defined as the ratio of the voltage applied to the electric current which flows through it.

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http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html#c1

Electrical resistance

Good revision site aimed at UK A Level standard covering resistance, ohm's law, conductivity etc

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http://www.s-cool.co.uk/alevel/physics/resistance.html

Metals are good conductors of electric current. That is, they have very low electrical resistance, but this resistance is not zero. Early in the last century, however, a Dutch physicist discovered ...

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http://www.physicscentral.com/action/action-01-3.html

Colour Coded Resistance Calculator

A simple program to help students calculate the resistance of a certain resistor. A very easy and simple site that works well and looks good.

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http://www.dannyg.com/examples/res2/resistor.htm

Norton's Theorem

Any collection of batteries and resistances with two terminals is electrically equivalent to an ideal current source i in parallel with a single resistor r. The value of r is the same as that in the ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/electric/norton.html#c1

Thevenin's Theorem

Any combination of batteries and resistances with two terminals can be replaced by a single voltage source e and a single series resistor r. The value of e is the open circuit voltage at the ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/electric/thevenin.html#c1

Gustav Robert Kirchhoff

Gustav Robert Kirchhoff (1814 - 1887) was a physicist who made important contributions to the theory of electrical circuits. Kirchhoff's laws, announced in 1854, allow calculation of currents, ...

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http://www-history.mcs.st-and.ac.uk/history//Mathematicians/Kirchhoff.html