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Post by IBDaMann on Jun 10, 2019 18:36:20 GMT
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Post by intothenight on Jun 27, 2019 17:52:22 GMT
A resistor of uniform material and cross section passing direct current can be calculated by the equation:
Resistance = Resistivity * Length/Area where: DC Resistance in ohms Resistivity is the coefficient of the ability of a material to resist in ohms/meter
Length in meters Area is the cross section in meters^2
Skin effect caused by alternating current effectively reduces usable cross section area. In addition, any practical resistor also has inductance and capacitance.
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Post by intothenight on Jun 27, 2019 18:19:09 GMT
A capacitor consists of two conductors separated by a resistance. Two wires near each other form a capacitor. The leads going to either end of a resistor forms a capacitor.
The value of a capacitor can be calculated as:
Capacitance (in farads) = Dielectric coefficient * area (in sq meters) / distance between conductors (in meters)
Most practical capacitors are in microfarads (uF) or picofarads (pF).
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Post by intothenight on Jun 27, 2019 18:30:24 GMT
An inductor consists of any conductor over a length. By coiling an inductor up into a helix, a inductance can be increased. For a simple helix inductor (a solenoid):
Inductance in Henrys = Permeability coefficient * Number of turns ^ 2 * Cross sectional area of inductor / length of inductor
For a straight conductor, the number of turns is considered equal to one.
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Post by intothenight on Sept 29, 2023 1:12:59 GMT
Selected levels of energy available (not including joules available by conversion to energy via E=mc^2).
54,000/gm Methane (natural gas)
47,200/gm Gasoline 45,000/gm Diesel oil 43,150/gm Kerosene
34,000/gm Coal (black grade)
18,000/gm Coal (brown grade)
720J/gm Lithium-ion battery 792/gm Sodium-sulfur battery
396/gm Silver-Zinc battery
158.4/gm Nickle-Cadmium battery
79.2J/gm Lead-acid battery
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