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Physics Chapter 7 Electric Circuits and Physiologic Analogs
AA Students
20
Medical
Graduate
09/06/2010

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Cards

Term
Resistance of a Wire
Definition

R = L ρ

   A

 

L = length

ρ = resistivity of material

A = cross sectional area

Term
Resistance to Flow in a Tube
Definition

R = 8ηL

      πr4

 

η = viscocity

L = length pipe

r = radius of blood vessel

Term
Ohm's Law
Definition

V = IR

 

V = voltage

I = current

R = resistance

Term
Conductance
Definition

C = I/V

 

(reciprocal of resistance)

Term
How do you add together voltages?
Definition
VT = V1 + V2 + V3...
Term
Resistance in a Series
Definition
R = R1 + R2 + R3...
Term
Resistance in Parallel
Definition

   1 = 1 + 1 + 1 ...

R    R1  R2  R3

Term
Capacitance in Series
Definition

   1 = 1 + 1 + 1 ...

C    C1  C2  C3

Term
Capacitance in Parallel
Definition
C = C1 + C2 + C3
Term
Inductance in Series
Definition
L = L1 + L2 + L3...
Term
Capacitance between plates
Definition

C = KA/d

 

K = dielectric constant

A = (m2)

d = distance between plates

Term
Inductance in Parallel
Definition

   1 = 1 + 1 + 1 ...

I    I1   I2   I3

Term
Diode
Definition
semiconductor allowing current to flow in one direction. (half of the alternating current sine wave)
Term
Capacitive Reactance
Definition

XC     1    

       (2πfC)

 

f = frequency (Hz)

C = Capacitance

 

Term
Inductive Reactance
Definition

XL = (2πfC)

 

f = frequency (Hz)

C = Capacitance

Term
Vascular Impedence
Definition

Z = √[ (R2) + (XL - Xc)2]

 

XL = Inductive Reactance

XC = Capacitive Reactance

Term
Time Delay
Definition
Φ = tan   ((XL - XC)/R)
Term
Power
Definition
P = IV
Term
Transformer Equation
Definition

Vs = Ns

Vp    Np

 

 

V = Voltage Primary and Secondary

N = number of turns in wire

Term
Resonance
Definition

fo =       1      

      (2π√LC)

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