Calcolatore Legge di Ohm

Calcola tensione, corrente, resistenza e potenza usando la Legge di Ohm.

Cos'e' Calcolatore Legge di Ohm?

Ohm's Law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage, current, resistance, and power in an electrical circuit. Named after German physicist Georg Ohm, this law is the foundation for understanding how electrical circuits work and is essential for anyone working with electronics.

Ohm's Law 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. This simple relationship allows you to calculate any one of these values if you know the other two, making it an indispensable tool for circuit design, troubleshooting, and analysis.

Formula

V = I × R (Voltage = Current × Resistance)

I = V / R (Current = Voltage ÷ Resistance)

R = V / I (Resistance = Voltage ÷ Current)

P = V × I (Power = Voltage × Current)

Where: V = Volts, I = Amperes, R = Ohms, P = Watts

Come Calcolare

Select which value you want to calculate (voltage, current, resistance, or power).
Enter the two known values in the corresponding fields.
The calculator computes the unknown value instantly.
View the power dissipation as a bonus calculation.
Use the results for circuit design or troubleshooting.

Esempio

A circuit has a 12V battery connected to a 4Ω resistor. To find the current: I = V/R = 12/4 = 3 amperes. The power dissipated by the resistor: P = V × I = 12 × 3 = 36 watts. This means the resistor must be rated for at least 36 watts to avoid overheating.

Vantaggi Principali

Calculate voltage current resistance power instantly
Solve unknown electrical values from two known
Verify circuit designs for safety compliance
Multiple power formulas complete analysis

Errori Comuni da Evitare

Confusione AC DC — Legge di Ohm vale per DC
Dimenticare conversioni da milliampere ad ampere
Formula di potenza sbagliata, wattaggio errato

Consigli Pro

Triangolo di Ohm V = I × R
Controlla potenza contro wattaggio nominale
In serie corrente costante, tensione si divide

Termini Chiave Spiegati

Tensione V: Potenziale elettrico volt
Corrente I: Flusso di carica ampere
Resistenza R: Opposizione ohm
Potenza P: Tasso trasferimento energia watt

Quando Usare Questo Calcolatore

Progettare o risolvere problemi di circuiti
Selezionare componenti per requisiti
Calcolare dissipazione di potenza sicura

Casi d'Uso Comuni

Designing electrical circuits for electronics projects
Troubleshooting household electrical problems
Sizing resistors and components for LED circuits
Understanding power consumption of electrical devices

Domande Frequenti

What does Ohm's Law tell us?

Ohm's Law describes the relationship between voltage, current, and resistance in an electrical circuit. It states that current is directly proportional to voltage and inversely proportional to resistance.

When doesn't Ohm's Law apply?

Ohm's Law applies to ohmic materials (like most metals) at constant temperature. It doesn't apply to semiconductors, diodes, transistors, or materials where resistance changes with voltage or temperature.

How is power related to Ohm's Law?

Electrical power (P = V × I) can be combined with Ohm's Law to give P = I²R or P = V²/R. These formulas help calculate how much energy a component dissipates as heat.

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