Ohm's Law
Calculate voltage using current and resistance
Interactive Sandbox
Adjust values in real-time and observe mathematical cause-and-effect
Direct Linear Proportionality with Resistance: Current (I) increases with Voltage (V) and decreases inversely with Resistance (R).
Variable Mechanics
Roles, constraints & impacts
Current
Formula Parameter
Resistance
Formula Parameter
At a Glance
Gotchas, units & real-world use
Formula Nature & Mechanics
Direct Linear Proportionality with Resistance: Current (I) increases with Voltage (V) and decreases inversely with Resistance (R).
Common Mistakes & Traps
- Assuming non-ohmic components (like diodes or transistors) follow linear V = IR at all operating points.
- Forgetting that high current (I) through resistance causes heat dissipation (P = I²R).
- Entering Resistance in kΩ without converting to standard Ohms (Ω).
Dimensional Analysis & Units
Volts (V) ÷ Ohms (Ω) = Amperes (A = C/s)
Real-World & Industry Application
Electronics circuit design, power supply safety sizing, battery life optimization, and PCB trace current limits.
Worked Example: Ohm's Law
Given:
- I = 2
- R = 5
- V = I × R
- V = 2 × 5
- V = 10 V
Answer: 10
Frequently Asked Questions
What is the Ohm's Law formula?
V = I × R. Calculate voltage using current and resistance.
How do I calculate Ohm's Law?
Enter Current (I), Resistance (R) into the calculator. It applies V = I × R and shows every step of the working.
Related Physics Calculators
Partner Spotlight
