Compute load voltage using flexible physics input methods. Check current, resistance, and power relationships instantly. Use clean inputs, export results, and compare worked examples.
| Case | Known Inputs | Method | Load Voltage | Extra Output |
|---|---|---|---|---|
| Example 1 | Vs = 24 V, Rs = 2 Ω, RL = 10 Ω | Source Voltage and Resistances | 20 V | I = 2 A, P = 40 W |
| Example 2 | I = 1.5 A, RL = 8 Ω | Current and Load Resistance | 12 V | P = 18 W |
| Example 3 | P = 25 W, RL = 16 Ω | Power and Load Resistance | 20 V | I = 1.25 A |
1. Source voltage and resistances: Vload = Vs × RL / (Rs + RL)
2. Current and load resistance: Vload = I × RL
3. Power and current: Vload = P / I
4. Power and load resistance: Vload = √(P × RL)
Supporting relations: P = V × I, I = V / R, and voltage drop = I × Rs
A load voltage calculator estimates the voltage that appears across a load. That load can be a resistor, heater, sensor, lamp, or test device. The value is often lower than the source voltage. Real circuits lose part of the supply across internal or series resistance.
Physics problems often ask for the effective voltage at the load. That number controls current, power, and energy transfer. A small change in resistance can change the final load voltage quickly. Good estimates help during lab work, homework, and circuit checks.
The calculator uses Ohm’s law and power relations. Voltage equals current multiplied by resistance. Power equals voltage multiplied by current. For source and load networks, it also uses the voltage divider rule. These equations describe how voltage splits between source resistance and load resistance.
Not every problem gives the same known values. Some questions provide source voltage and two resistances. Others provide current and load resistance. Some give power with current or power with resistance. Multiple input methods let you solve the same load voltage from different starting points without extra rearranging.
This tool fits classroom physics, basic electronics, bench testing, and troubleshooting. It can check battery loaded voltage, resistor network behavior, heating elements, and simple DC equipment. It also helps compare design choices. You can see how a larger series resistance lowers delivered voltage and power.
Keep units consistent before you calculate. Enter volts, amperes, ohms, and watts directly. Use positive values for physical measurements. For divider problems, this model assumes a resistive circuit. Reactive AC effects are not included. That keeps the output clean for foundational physics work.
If load voltage stays close to source voltage, the load dominates the circuit. If the value drops sharply, source resistance or current demand is significant. Use the output to compare batteries, supplies, or simple laboratory setups. This helps you choose a better operating condition with less guesswork.
A clear result block makes review easier. You can read load voltage, current, power, voltage drop, and transfer percentage together. The export options help with notes and reports. For students and technicians, a dedicated load voltage calculator reduces manual errors and saves time during repeated analysis.
Load voltage is the actual voltage across the device or resistor being powered. It is the value the load receives during operation, not just the open source value.
Part of the source voltage may drop across internal resistance, wiring resistance, or a series element. That reduces the voltage available at the load terminals.
Use it when you know the source voltage, source resistance, and load resistance. It is ideal for simple resistive source and load circuit models.
This version is best for resistive physics and basic DC problems. It does not include reactance, impedance phase angle, or frequency based AC effects.
Enter volts for voltage, amperes for current, ohms for resistance, and watts for power. Consistent units help produce correct and directly readable results.
It shows how much of the source voltage reaches the load. A higher percentage means the load receives a larger share of the available supply voltage.
Load power shows how much energy per second the load consumes. It helps check component ratings, heating effects, and whether the operating point is realistic.
Yes. Use the CSV button to export the result values. Use the PDF button to open a printable version that you can save as a PDF file.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.