Ohm's Law
Calculate Voltage, Current, Resistance.
Circuit Calculator
- No resistors added.
will appear here
Enter values to calculate...
Online Electrical Calculator (Ohm’s Law + Series & Parallel Resistance)
Are you searching for a free online electrical calculator? This page provides a smart Ohm’s Law Calculator + Series and Parallel Resistor Calculator in a single tool, designed for students, engineers, technicians, ITI learners, diploma holders, and hobbyists.
Using the above embedded widget, you can easily calculate:
✔ Voltage (V)
✔ Current (I)
✔ Resistance (R)
✔ Power (P)
✔ Total Resistance in Series
✔ Total Resistance in Parallel
This online Circuit Calculator visually shows the diagram and gives step-by-step solutions, making it the best tool for exam preparation and real-world electrical work.
What Is Ohm’s Law? (Definition & Formula)
Ohm’s Law explains the relationship between Voltage (V), Current (I) and Resistance (R).
The main formula is: V = I × R
Where:
- V = Voltage (in Volts)
- I = Current (in Amperes)
- R = Resistance (in Ohms)
Ohm’s Law Formula Variations
| To Calculate | Formula |
|---|---|
| Voltage (V) | V = I × R |
| Current (I) | I = V ÷ R |
| Resistance (R) | R = V ÷ I |
| Power (P) | P = V × I |
Online Series & Parallel Resistance Calculator
In electrical circuits, multiple resistors can be connected in Series or Parallel.
🟢 Series Resistor Formula: R(total) = R1 + R2 + R3 + …+ Rn
➡ In series, resistance increases.
🟢 Parallel Resistor Formula: 1 / R(total) = 1/R1 + 1/R2 + 1/R3 + …+ 1/Rn
➡ In parallel, resistance decreases.
Use the calculator above to add resistors and get instant total resistance with circuit diagrams.
Why Use This Online Electrical Calculator?
| Feature | Benefit |
|---|---|
| Ohm’s Law + Resistor Calculator | All-in-one tool |
| Step-by-step solution | Great for students & learning |
| Auto circuit diagram | Clear visualization |
| Mobile responsive | Works on all devices |
| Free to use | No login, no cost |
| Supports V, I, R, P | Complete electrical math |
How to Use the Ohm’s Law Calculator? (Step-by-Step)
- Select what you want to find: Voltage / Current / Resistance / Power
- Enter the known values (e.g., Current & Resistance)
- Click Calculate
- You will get:
- Numeric Answer
- Formula Used
- Step-by-Step Solution
- Circuit Diagram
How to Use the Series/Parallel Resistance Calculator?
- Select Series or Parallel
- Enter resistor values (like 10Ω, 20Ω…)
- Click Add
- Instantly see:
- Total Resistance
- Step Calculation
- Circuit Diagram
You can even remove or reset values anytime.
Real-Life Uses of Ohm’s Law Calculator
This free tool is helpful for:
📌 Designing electrical circuits
📌 Physics homework and projects
📌 LED resistor calculation
📌 Battery and charger design
📌 Testing motor or power supplies
📌 Electronic component selection
FAQs – Ohm’s Law Calculator
- Q1-What is an Online Ohm’s Law Calculator?
- It’s a digital tool used to calculate Voltage (V), Current (I), Resistance (R), and Power (P) based on Ohm’s law formulas.
- Q2-How do I calculate current from voltage and resistance?
- Use: I = V ÷ R
- Q3-Which gives more resistance, series or parallel?
- Series = Higher Total Resistance
- Parallel = Lower Total Resistance
- Q4-Can I use this calculator on mobile?
- Yes, it is 100% mobile responsive and works on all devices.
- Q5-Is this calculator free?
- Yes, it is completely free, with no signup required.
Conclusion
This Online Electrical Calculator is a complete solution for all basic electronics calculations, including:
✔ Ohm’s Law
✔ Voltage, Current, Resistance, Power
✔ Series & Parallel Resistance
✔ Stepwise explanation + Visual diagrams
Whether you are a student, engineer, teacher, electrician, or electronics hobbyist, this tool will greatly help in learning and practical calculations.
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