What is the Electric Resistance of Plaster of Paris?
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Well, gypsum is a good insulator.  Its resistance would depend on what impurities (such as moisture) were present in it.  \n\nIf you are planning on using this with high voltage,  you should be more concerned with the dielectric breakdown voltage than the resistance.  This is the voltage at which a material that is normally an insulator will begin to permit electricity to arc through it.  Check the link below for more information.
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http://lakeaccess.org/russ/conductivity.htm
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The best way is to get it from the manufacturer.  If you don't know who made it, you can look up resistances from a bunch of places on the net if you know the wire gauge, but remember that copper resistance increases as it gets hot.  \n\nMost magnet wire can handle a few hundred volts with no troubles, but if you're doing some high voltage app, better be sure about the voltage rating.
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I suppose you are reffering to the small digital scales. They have a device whos electrical resistance changes under pressure.
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Resistance=Voltage/Amperes
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Calculate the electricity.
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chemical and electrical
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One of the most frequently used is E=IR    ;E =voltage    I=current   R= resistance. U can change this every way depending on the unknown.\n    Good luck
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Well, a clear question would help. \n\nAre you trying to calculate the power that a certain material can withstand?   Or are you trying to calculate strength?
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(m)\n\ngoto the following website for your question with neat diagrams\n\nhttp://hyperphysics.phy-astr.gsu.edu/HBASE/electric/gaulaw.html
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pie   p power = i current x e voltage\n      e = i x r resistance
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Electrical resistance is that element of electrical circuit which opposes flow of current through it.\n1.Resistance is dependent on the material.Like wood is insulator(ALMOST infinite resistance).\n2.Resistance of a wire having more cross sectional area is less and less cross sectional area is more(i.e. it is inversely propotional to the cross sectional area.)\n3.It is more for more length and less for less length.\n4. Resistance varies with temprature.For metals like platinum it increses with temprature.
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I'm supposing that by R-value you mean resistance value.\n\nIf so, there are two separate formulas. \nFirst for R-values in series, meaning, materials which are layered: \n\nRtotal =R1 + R2 +...+ Rn\n\nFor R-values in parallel, meaning two or more materials side by side:\n\n(1/Rtotal) = 1/R1 + 1/R2 +...+ 1/Rn
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for an ohmic material:\n\nP=VI\nV=IR\nso\nP=I^2 * R\n\ncheers!
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Ideally a capacitor has an infinite resistance (which is a DC measurement). However the AC equivalent of resistance, reactance (usually denoted as X), tells you how much AC current a capacitance passes with a given AC voltage applied across its terminals. Reactance depends on the AC frequency. It is X = 1/(C*W), where C is capacitance and W (omega) is 2*pi*frequency. Similarly to Ohm's law, you can find average current from E = I*X. Unlike Ohm's law, this is true for average current but not for instantaneous current, since E and I are 90 degrees out of phase.
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Resistance does not depend upon the ductility of the metal used in the wire.\nDuctility is the property of the substance to be easily drawn into wires.  This does not effect electrical resistance.
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The following is from Wikipedia:\n\n"In a normal conductor, an electrical current may be visualized as a fluid of electrons moving across a heavy ionic lattice. The electrons are constantly colliding with the ions in the lattice, and during each collision some of the energy carried by the current is absorbed by the lattice and converted into heat (which is essentially the vibrational kinetic energy of the lattice ions.) As a result, the energy carried by the current is constantly being dissipated. This is the phenomenon of electrical resistance."\n(See "superconductor")\n\nAs to length and disregarding superconductors, any unit length n of a material has the property of electrical resistance.  Since resistances in series add, a length 2n will have 2 times the resistance of a length n, etc.  Also see "resistance" in wikipedia, where rho is defined.