Electricity Flashcards
Coulombs law
F=k (Q1xQ2)/R
Charge of an electron
-1.6x10^-19
Current is equal to
Q=IT
Ohms law
The ratio of the potential difference to current is constant
The 4 Equations of voltage and power
V=IR
P=IV
P= (I^2)R
P=(V^2)/R
What is potential difference?
Potential is the voltage used by a component
Temperature-dependent resistance
R(t)=R(To)(1+a(T-To)) where a is the temperature coefficent
Parallel resistance
Rt= (R1)(R2)/R1+R2
Series resistance
Rt=R1+R2+R3
Voltage divider rule
Vr1=R1/(R1+R2+R3) X V
Current divider rule
I2=R1/(R1+R2)xI Two branches only, Parallel.
Describe kirchoffs current law
The algebraic sum of any node is 0
Describe kirchoffs voltage law
The voltage sum of any loop is zero
Ideal voltage source is measured in
Series
Ideal current source is measured in
Parallel
An ideal source has no
Resistance
Describe Thevenins Theory
1) Remove Load, Calculate open voltage Vt
2) Remove Load, short circuit, replace current source with open circuit, calculate Rt
3) Form Thevenins equivalent circuit
4) To find load current, connect the load resistor to Thevenins equivalent circuit, carry out current equation I=V/R
Period of a wave
T=1/F
Equation of a general sinusoid
V(T)=VmSIN(ωt+Φ) ω=Angular frequency Φ=Phase shift
Equations for a Non Inverting Op-Amp
Av=1+Rf/Ri Vo=(1+Rf/Ri)Vi
Equations for a Inverting Op-Amp
A= - (Rf/Ri) Vo= - (Rf/Ri)Vi
Equations for a Summing Op-Amp
Av=Rf/(Rn/i) Vo=-Rf(((V1/R1)+V1/R2)+V1/R3)
Equations for a Differential Op-Amp
Av=Rf/Ri AvVo/(V2-V1) Vo=Rf/Ri(V2-V1)
what is slew rate and its equation
The rate at which a square wave reaches its peak. Max slope from normal = Slew rate
order of operation in boolean algebra
Inversion
AND
OR
