1. What is Ohm's Law?

Ohm's Law is a fundamental principle in electrical engineering that defines 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.

2. How Does the Calculator Work?

The calculator uses Ohm's Law equation:

Where:

• \( R \) — Electrical resistance (Ω)
• \( V \) — Voltage (V)
• \( I \) — Current (A)

Explanation: The equation shows that resistance equals voltage divided by current. This relationship is linear for ohmic conductors at constant temperature.

3. Importance of Resistance Calculation

Details: Calculating resistance is essential for designing electrical circuits, selecting appropriate components, troubleshooting electrical problems, and ensuring electrical safety in various applications.

4. Using the Calculator

Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What are the units of measurement for resistance?
A: Resistance is measured in ohms (Ω), named after German physicist Georg Ohm who formulated the law.

Q2: Does Ohm's Law apply to all materials?
A: Ohm's Law applies to "ohmic" materials where resistance remains constant regardless of voltage. Some materials like semiconductors are non-ohmic.

Q3: What is the relationship between power and resistance?
A: Electrical power (P) can be calculated using P = V²/R or P = I²R, showing how power relates to resistance in a circuit.

Q4: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.

Q5: Can I calculate voltage or current using this formula?
A: Yes, the formula can be rearranged to V = I×R to calculate voltage, or I = V/R to calculate current.