Home
Back
Ohm's Law Formula:
| From: | To: |
Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them.
The calculator uses the Ohm's Law formula:
Where:
Explanation: This formula allows you to calculate the current flowing through a circuit when you know the voltage applied and the resistance of the circuit.
Details: Ohm's Law is essential for designing and analyzing electrical circuits, calculating power consumption, determining appropriate wire sizes, and ensuring electrical safety in various applications from household wiring to complex electronic devices.
Tips: Enter voltage in volts and resistance in ohms. Both values must be positive numbers greater than zero. The calculator will compute the current in amperes.
Q1: What are the units used in Ohm's Law?
A: Voltage is measured in volts (V), current in amperes (A), and resistance in ohms (Ω).
Q2: Does Ohm's Law apply to AC circuits?
A: Ohm's Law applies to AC circuits when dealing with resistive loads, but for reactive components (inductors and capacitors), impedance must be considered instead of pure resistance.
Q3: What is the power formula related to Ohm's Law?
A: Power (P) can be calculated as P = V × I, or using variations: P = I² × R or P = V² / R.
Q4: When is Ohm's Law not applicable?
A: Ohm's Law doesn't apply to non-ohmic materials like semiconductors, diodes, and transistors where the current-voltage relationship is non-linear.
Q5: How accurate is this calculator?
A: The calculator provides theoretical values based on ideal conditions. In real-world applications, factors like temperature, material properties, and circuit design may affect actual results.