# Ohm’s Law Calculator for Voltage, Current, Resistance, and Power

Ohm’s Law is a fundamental principle in electrical engineering and physics, describing 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.

Ohm’s Law can also be extended to include the concept of electrical power. Power in an electrical circuit is the rate at which electrical energy is converted to another form of energy, such as heat, light, or mechanical energy. The unit of power is the watt (W).

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## What is Ohm's Law?

Ohm’s Law (E = IR) is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.

The full forumal is E = I x R where E = Volts, I=current (in amps), and R=resistance. This is also sometimes annoted as voltage = current x resistance, or volts = amps x ohms, or V = A x Ω.

### Popular manufacturers

The table below highlights our wide range of leading resistor manufacturers and some of their key attributes:

ManufacturersDetails
• High performance, high stability film SMD as well as axial and radial through-hole resistors
• Precision low and high ohmic, high voltage, high temperature and non-inductive high power resistors

• High performance, high voltage and high ohmic thick film SMD and through-hole resistors
• Utilises Micropenning® to offer the most precise and stable high voltage, high ohmic resistor packages available

• High precision, high stability, wirewound through-hole resistors
• Standard tolerances of ±0.01% and ±0.1% available with a TCR of 5ppm/°C maximum between -55°C and +125°C

• Low ohmic, precision and power SMD and through-hole resistors with excellent current and pulse handling capabilities
• 2 and 4-terminal designs available in both SMD and through-hole packages as well as automotive and space approval on various products

• State-of-the-art high power metal clad wirewound resistors and resistor assemblies
• Both inductive and non-inductive designs in various package types with UL approved and IP65 rated options available on select models

• Specialist high power, wirewound, precision resistors including precision current and DC current base mounted shunts
• Excellent high pulse, high temperature resistors with a wide range of tight TCR and tolerance options

• High voltage, high ohmic, high temperature thick film resistors with high temperature variants available up to +300°C
• High ohmic resistors, up to 10TΩ, and high voltage resistors with Non-magnetic models available in both SMD and through-hole packages

• Ultra-high precision, thin film SMD resistors and resistor networks
• Specialist in thin film and metal foil SMD resistors covering a wide range of resistance values and applications