Resistor Circuits
Online calculators for resistor networks and voltage dividers
Fundamentals and Parallel Circuits
Ohm's Law
Basic calculation of U, I and R
Two Parallel Resistors
Total resistance of two parallel resistors
Multiple Parallel Resistors
Total resistance of any number of parallel resistors
Voltage Dividers
Unloaded Voltage Divider
Output voltage of an unloaded voltage divider
Loaded Voltage Divider
Output voltage considering load resistance
Pi Attenuator
Resistance values for Pi attenuators
T Attenuator
Resistance values for T attenuators
Measurement Technology
Series Resistor (Voltmeter)
Measuring range extension for voltmeters
Shunt Resistor (Ammeter)
Measuring range extension for ammeters (shunt)
About Resistor Circuit Calculators
This calculator collection covers all important aspects of resistor circuits. From basic parallel circuits through voltage dividers to complex network analyses and high-frequency attenuators.
- Fundamentals - Ohm's law, parallel circuits
- Voltage Dividers - Loaded and unloaded
- Attenuators - Pi and T configurations
- Measurement - Series and shunt resistors
- RF Technology - Impedance, attenuation
- Education - For study and profession
Note: All calculators contain detailed explanations and are designed for
electronics development, measurement technology and education.
Important Formulas
Basic Laws
U = R × I
P = U × I = I²R
G = 1/R
Circuits
Series: Rtotal = R₁ + R₂ + ...
Parallel: 1/Rtotal = 1/R₁ + 1/R₂
Applications
Voltage Divider:
Uout = Uin × R₂/(R₁+R₂)
Uout = Uin × R₂/(R₁+R₂)
Measurement:
Series res.: Rs = Ri(n-1)
Shunt: Rsh = Ri/(n-1)
Series res.: Rs = Ri(n-1)
Shunt: Rsh = Ri/(n-1)