Dropping Resistor Calculator
- Starting Voltage - The starting voltage of the circuit. This is in Volts
- Needed Voltage - The voltage that is needed, which is lower then what you have.
- Current Draw - How much does this device circuit to draw the voltage in AMPS
- Required Dropping Resistor - The Series Resistor in ohms (Ω)
- Minimum Resistor Wattage - The Minimum resistor wattage, this is actually what the circuit draws so you should use a larger value to keep the resistor from over heating.
Formula:
Calculate Resistor Wattage from the Current and Resistance using another of Ohm's Formula
P = I2R
Where,
P = Power in Watts
I = Current in Amps
R = Resistance in Ohms
Calculate the needed Resistance using one of Ohm's Formula
R = V / I
Where,
R = Resistance in Ohms
V = Force in Volts
I = Current in Amps
Calculate Resistor Wattage from the Current and Resistance using another of Ohm's Formula
P = I2R
Where,
P = Power in Watts
I = Current in Amps
R = Resistance in Ohms
Calculate the needed Resistance using one of Ohm's Formula
R = V / I
Where,
R = Resistance in Ohms
V = Force in Volts
I = Current in Amps
