electronic fundamental formulas

electronic fundamental formulas

1. engineering notation

   • multiples of 3

2. electrical charge

   • measured in coulombs
     • 1 coulomb 6.25 x 10^18 electrons
     • 1 electron = 1.6 x 10^-19 C

3. current = I=Q/t

4. ohms law

   • V= I x R
     • power is measured in Watts(W)
       • W = P x t
       • P = I x V

5. resistors in series

   • Rt = R1+R2+R3+....+Rn
   • resistors in parrallel
     • Rt = 1/(1/R1)+(1/R2)+(1/R3)

6. kirchoffs voltage law

   • the sum of all the voltage drops in a closed path is equal to the source voltage
   • Vt = Vr1 + Vr2 + Vr3
   • voltage divider formula
     • Vx = I * Rx

7. kirchoffs current law

   • sum of current into junction = sum of current out
     • current divider N branches Ix = It(Rt/Rx)

8. capacitors in series

   • same as resistors in parrallel
   • capacitors in parrallel
     • same as resistors in series
   • Vx = (Ct/Cx)*Vs

9. inductors in series

   • same as resistors
   • inductors in parrallel
     • same as resistors

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