notes/Ohm's Law.md

#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.