Variable

Description

 

 

Qp,Qs

Parallel and series quality factors

r

Charge distance

R,R1,R2

Resistance

ri,ro

Inside and outside radii

Rp,Rs

Parallel and series resistances

t

Time

ti,tf

Initial and final times

V

Voltage, or Total voltage (Voltage Divider)

V1

Voltage across R1

Vi,Vf

Initial and final voltages

Vmax

Maximum voltage

XC

Reactance of capacitor

XL

Reactance of inductor

 

 

Reference: 3.

 

Coulomb’s Law (2, 1)

This equation describes the electrostatic force between two charged particles.

Equation:

F =

-------------------------------

1

∈ ⋅

q1 ⋅ q2

4 ⋅ π ⋅

∈

---------------2-

 

0 ⋅

r

r

 

 

 

 

Example:

Given: q1=1.6E-19_C, q2=1.6E-19_C, r=4.00E-13_cm, ∈ r=1.00.

Solution: F=14.3801_N.

Ohm’s Law and Power (2, 2)

Equations:

V = I ⋅ R

P = V ⋅ I

P = I

2

⋅ R

P =

V2

 

------

 

 

 

 

 

 

R

Example:

Given: V=24_V, I=16_A.

Solution: R=1.5_‡, P=384_W.

5-10 Equation Reference