SAT物理考试：光学、电磁学、热学常考公式汇总

SAT物理考试：光波学、电磁学、热力学常考公式汇总！

物理光波学常见公式：

　　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

　　物理电磁学常见公式：

　　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

　　物理热力学常见公式：

　　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