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education/computer engineering/Ohm's Law.md

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+#notes
+#school
+#electricity
+
+
+Summary:
+-   **Voltage** is the difference in charge between two points.
+-   **Current** is the rate at which charge is flowing.
+-   **Resistance** is a material’s tendency to resist the flow of charge (current).
+-   Water = **Charge**(Coloumbs)
+-   Pressure = **Voltage**(Volts)
+-   Flow = **Current**(Amps)
+-   Hose Width = **Resistance**(Ohms
+  
+### Equations
+-   V = Voltage in volts
+-   I = Current in amps
+-   R = Resistance in ohms
+
+Solving for Voltage:
+`V = I * R`
+Solving for Current:
+`I = V / R`
+Solving for Resistance:
+`R = V/I`
+
+
+### Applying Concepts
+If a resistor has a 20 mAh current rating, and it's being powered with a 9 volt battery.
+To find the appropriate resistor for the LED, you solve for resistance with `R = V/I`, where V=9 and R = a number less than 0.02, like `9/0.018 = 500`, so you would want a resistor with a voltage at or greator than about 500 Ohms.