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exam 2 notecard - V=IR Resistors in Series Req = R1 R2...

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V=IR Resistors in Series: R eq = R 1 + R 2 + Current is constant, Voltage Changes Resistors in Parallel: 1 R e q = 1 Ρ 1 + 1 Ρ 2 + ... Voltage is constant, current changes *Current always takes path of least resistance Kirchhoff’s Rules: current in=current out for junctions – total V in any loop=0 (V conserved) - + : emf is positive; + - emf is negative in direction of current: IR is negative opposite current: IR is positive RC Circuits: charging capacitor q = Χε (1- ε - τ / ΡΧ 29 = Θ φ (1- ε - τ / ΡΧ 29 ; i = δθ δτ = ε Ρ ε - τ / ΡΧ = Ι 0 ε - τ / ΡΧ τ = RC small=charge fast, big=slow discharging capacitor: q = Θ 0 ε - τ / ΡΧ ; i = δθ δτ = - Θ 0 ΡΧ ε - τ / ΡΧ = Ι 0 ε - τ / ΡΧ Power: P=VI=I 2 R= ε I Moving charge or current creates magnetic field that exerts a force on any other moving charge or current. it’s proportional to mag of charge & field. Depends on velocity & perpendicular to field & velocity. F mag =qvBsin ϕ =qv x B F E&B =q(E + v x B) Magnetic flux: φ B = B dA= BAcos ϕ φ B =BAcos ϖ t Gauss’s Law: total magnetic
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