HP 50g Graphing, 48gII Graphing manual Coulomb’s Law 2, Ohm’s Law and Power 2

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	∈		 2	
		⋅ π ⋅ 0 ⋅	r	r
Example:
Given: q1=1.6E19_C,		q2=1.6E19_C,			r=4.00E13_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.

510 Equation Reference