2018-04-29 09:15 三立在线
Heat added or emoved: Q = m·c·ΔT
Change in Internal Energy: ΔU = Q - W
Boyle's Law: P1V1 = P2V2
Charles's Law: V1/T1 = V2/T2
Efficiency of a heat engine(%): E = (W/Qhot)·100
Snell's Law: n1·sin(θ1) = n2·sin(θ2)
Wave speed: v = λ·f
Velocity of light: v = c/n
Magnification: m = -di/do
Law of Reflection: θreflection = θincidence
Mirror and lens equation: 1/d1 + 1/d1 = 1/f
Electric Fields and Forces Formulas
Coulomb's Law: F = k·q1·q1/r2
Electric field of a charge q: E = k·q/r2
Work done by electric field: W = q·E·d
Electric field between two metallic plates: E = V/d
DC Circuits Formulas
Ohm's Law: V = I·R
Power dissipated in a resistor: P = I·V = V2/R = R·I2
Resistance: R = ρ·l/A
Equivalent resistance of series resistors: Rs = R1 + R2 +...
Equivalent resistance of parallel resistors: 1/Rp = 1/R1 + 1/R2 +...
Equivalent capacitance of series capacitors: 1/Cs = 1/C1 + 1/C2 +...
Equivalent capacitance of parallel capacitors: Cp = C1 + C2 +...
Magnetic Fields and Forces Formulas
Magnetic force on a moving charge: F = q(v x B) = q·v·B·sin(θ)
Magnetic force on a current carrying wire: F = I·l·B·sin(θ)
Magnetic field created by a current: B = (μo/2π)·(I/r)
Faraday's Law: E = -dΦ/dt