# Voltage Divider
# Divides voltage between resistors
# Giving you say 5v from 12v.
# DOES NOT REDUCE AMERAGE.  1A in = 1A out.  6A in = 6A out.


# Equasion to calculate voltage:
#
# V = (Vtotal/Rtotal) x R1
# 12v Circuit
#
# V = (12v/(R1(2ohm) + R2(10ohm))) * R1(2ohm)
# V = (12v/(12ohm) * 2ohm
# V = (1 * 2ohm)
# V = 2 ohm
#
# Example 1, 12v in, R1 = 1ohm, R2 = 1ohm
# V = (12v/(R1 + R2) * R1)
# V = (12v/(1ohm + 1ohm) * 1ohm)
# V = (12v/(2ohm) * 1ohm)
# V = (12v/ 2)
# V = (6)
# Voltage across R2 = 6v.  Must mean voltage across R1 = 6v also, because total voltage is 12v.
#
# Example 2, 12v in, R1 = 5ohm, R2 = 25ohm
# V = (12v/(R1 + R2) * R1)
# V = (12v/(5ohm + 25ohm) * 5ohm)
# V = (12v/(30ohm) * 5ohm)
# V = (12v/(150ohm))
# V = (float(0.08))
# Big voltage loss...  Is that what you want?



# Equasion to find voltage:
#
# 12v circuit, calculate resistor values.
#
# R2 = R1 x (Desired vOut / (vIn - vOut)
# R2 = R1 x (5v / (vIn - vOut)
# R2 = R1 x (5v / (12v - 5v)
# R2 = R1 x (5v / (7v)
# R2 = R1 x (5/7)
# Algebra!  Solve for R1.
# Or, pick one resistor and call it R1.  Solve for R2.
# No more Algebra.
#
# Example 1, 12v in, R1 = 2ohm, R2 = 10ohm
# R1 = 2ohm
# R2 = 10ohm
# vTotal = 12v
# rTotal = R1 + R2
# V = R1 * (vTotal / rTotal)
# V = R1 * (12v / (R1 + R2)
# V = 2 * (12v / (2+10)
# V = 2 * (12v / 12)
# V = 2 * 1
# V = 2v
#
# Example 2, 12v in, 5v out:
# vIn = 12v
# vOut = 5v
# R1 = 10ohm
# R2 = ???
# R2 = R1 x desiredVOut / (vIn - vOut)
# R2 = R1 x 5v / (vIn - vOut)
# R2 = R1 x 5v / (12v - 5v)
# R2 = R1 x 5v / 7v
# R2 = R1 x float(0.714)
# R2 = 10ohm x float(0.714)
# R2 = float(7.14)
# R2 = int(rnd(R2))
# R2 = 7ohm Resistor
# Love Maths.