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### 32 Cards in this Set

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 voltage, V U/Q (energy per unit charge) Vs Vr + Vb Current, I [A] = delta Q/ delta t Current, I = n.A.Vave.e ohms law R = V/I Impedance, Z Z = V/I Capacitance, C = Q/V Reactance of capacitor, Xc = V(t)/C(t) = 1/jwc |reactance of capacitor|, |Xc| = 1/wc = 1/2pifC Voltage across inductor, VL = L . dI/dt impedance across inductor, ZL = XL = jwL Power, P = VI = I^2R = V^2/R rms value = A/SQRT2 Irms = Imax/SQRT2 Vrms = Vmax/SQRT2 Prms = Vrms . Irms Energy = P x t Cost kWh kWh x running time x £ per kWh Voltage across potential divider V1 = R1/R1+R2 . Vs Current divider rule I1 = R1/R1+R2 . Is Linear circuit Vout = k Vin Low pass filter - gain G = Vout/Vin = Xc/R+Xc Low pass filter - |gain| |G| = 1 / SQRT(1 + (wCR)^2) Critical frequency, fc fc = 1 / 2.pi.RC High pass filter - Vout, Vout = R / R+Xc . Vin High pass filter, gain G = |Vout/Vin | = wCR / SQRT( 1 + (wCR)^2 ) Time Constant, tau tau = RC 98% for time constant = 4(tau) Diode equation Id = Is ( e^(qV/nkT) -1 )Is - reverse saturation currentk - boltzmann constantT - absolute temperature V - applied voltage across diode n - ideality factor ( n=1=ideal diode)q - charge of electron Kirchoffs Current rule (KCR) The total current entering a node in a circuit is equal to the total current leaving that node entering node +veleaving node -ve Kirchhoffs Voltage rule (KVR) The sum of all voltage sources and drops (sinks) around a closed circuit loop Inductance, L = N^2 . uo . ur A / l