Reference Guide
5-10 Equation Reference
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:
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
V
2
R
------
=
Example:
Given:
V=24_V, I=16_A.
Solution:
R=1.5_Ω, P=384_W.
F
1
4
π
∈
0
∈
r
⋅
⋅
⋅
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q
1
q
2
⋅
r
2
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⋅
=