Current Electricity
Telangana Open School (TOSS) · Class 12 · Physics
All formulas from Current Electricity in Telangana Open School (TOSS) Class 12 Physics. Key equations, constants, and identities for board exam preparation.
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Formulas
Electric Current and Drift Velocity
I = \frac{\Delta q}{\Delta t}
I = nAev_d
Ohm's Law and Resistivity
V = IR
R = \rho \frac{l}{A}
\rho = \frac{m}{ne^2\tau}
Combination of Resistors
R_s = R_1 + R_2 + \dots
\frac{1}{R_p} = \frac{1}{R_1} + \frac{1}{R_2} + \dots
Temperature Dependence and Superconductors
\rho = \rho_0 [1 + \alpha (T - T_0)]
R = R_0 [1 + \alpha (T - T_0)]
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