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General Values and Vectors by S.S. Education, Kota |
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ELECTRIC CHARGES AND FIELDS S.S. Education, Kota |
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CAPACITANCE by S.S. Education, Kota |
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RESISTANCE by S.S. Education, Kota |
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MAGNETISM by S.S. Education, Kota |
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INDUCTIVE & RCL CIRCUITS by S.S. Education, Kota |
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RESISTANCE
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Emf: A voltage source which can provide continuous current
[volts]
Î = IR + Ir
Î = emf open-circuit voltage of the battery
I = current [amps]
R = load resistance [ohms]
r = internal battery resistance [ohms]
Resistivity: [Ohm Meters]
r = E/J
r = RA / L
r = resistivity [ohm · m]
E = electric field [N/C]
J = current density [A/m2]
R = resistance [ohm ohms]
A = area [m2]
L = length of conductor [m]
Variation of Resistance with Temperature:
r - r0 = r0 a (T-T0 )
r = resistivity [ohm · m]
r0 = reference resistivity [ohm· m]
a = temperature coefficient of resistivity [K-1]
T0 = reference temperature
T – T0 = temperature difference [K or °C]
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