Home
Back
Ohm's Law:
| 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.
The calculator uses Ohm's Law formula:
Where:
Explanation: The resistance is calculated by dividing the voltage by the current flowing through the circuit.
Details: Calculating electrical resistance is crucial for designing electrical circuits, selecting appropriate components, ensuring safety, and troubleshooting electrical systems. It helps in determining the proper resistor values for various applications.
Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the unit of electrical resistance?
A: The unit of electrical resistance is the Ohm (Ω), named after German physicist Georg Simon Ohm.
Q2: Can Ohm's Law be used for AC circuits?
A: Ohm's Law applies to both DC and AC circuits, but for AC circuits, impedance (which includes resistance, capacitance, and inductance) should be considered.
Q3: What are typical resistance values in electronic circuits?
A: Resistance values can range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, with common resistor values typically between 1Ω and 10MΩ.
Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature, while for semiconductors, resistance typically decreases with temperature.
Q5: What is the difference between resistance and resistivity?
A: Resistance is a property of a specific object, while resistivity is a material property that describes how strongly a material opposes electric current.