Ohm's Law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage, current, and resistance in an electrical circuit. Understanding these parameters is essential for designing safe electrical systems, troubleshooting circuit boards, and calculating power requirements for household appliances.
Ohm's Law & Power Formulas
Voltage (V) = Current (I) × Resistance (R)Power (P) = Voltage (V) × Current (I)
How to Use This Calculator
- Select the electrical value you want to calculate (Voltage, Current, Resistance, or Power).
- Enter the two known values into their respective fields.
- Ensure your units are correct (Volts, Amperes, Ohms, Watts).
- Click Calculate to instantly solve for the missing electrical properties.
Frequently Asked Questions (FAQ)
What is the difference between Voltage and Current?
Voltage is the electrical pressure or potential difference that pushes electrons through a conductor. Current is the actual flow rate of those electrons. Think of voltage as water pressure in a pipe, and current as the amount of water flowing through it.
Why is resistance important?
Resistance limits the flow of electrical current, preventing wires from overheating and components from blowing out. It is measured in Ohms (Ω) and is intentionally added to circuits using resistors to control electron flow.