Calculate Total Resistance of Parallel Resistors Using Python

Program Overview

This Python program calculates the total (equivalent) resistance of three resistors—RF, RX, and R1—connected in parallel.
The formula used for parallel resistance is:
1 / RT = 1 / RF + 1 / RX + 1 / R1
Where RT is the total resistance.

Python Code:

# Get resistor values from user
RF = float(input("Enter resistance RF (ohms): "))
RX = float(input("Enter resistance RX (ohms): "))
R1 = float(input("Enter resistance R1 (ohms): "))

# Calculate total resistance in parallel
inverse_total = (1 / RF) + (1 / RX) + (1 / R1)
RT = 1 / inverse_total

# Display result
print("\n--- Result ---")
print(f"Total resistance (RT) = {RT:.2f} ohms")

Sample Output:

Enter resistance RF (ohms): 100  
Enter resistance RX (ohms): 200  
Enter resistance R1 (ohms): 300  

--- Result ---  
Total resistance (RT) = 54.55 ohms

Explanation:

- The user inputs the resistance values for RF, RX, and R1
- The program calculates the reciprocal of each resistance and sums them
- The total resistance is the reciprocal of that sum
- The result is displayed with two decimal places for clarity