1. What is Resistance in DC Circuit?

Resistance is a measure of the opposition to current flow in an electrical circuit. In DC circuits, resistance follows Ohm's Law, which 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 formula:

Where:

• \( R \) — Resistance (Ohm)
• \( V \) — Voltage (Volt)
• \( I \) — Current (Ampere)

Explanation: The formula calculates the resistance by dividing the voltage by the current flowing through the circuit.

3. Importance of Resistance Calculation

Details: Accurate resistance calculation is crucial for designing electrical circuits, selecting appropriate components, ensuring proper current flow, and preventing circuit damage due to excessive current.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is Ohm's Law?
A: 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 between them.

Q2: What are typical resistance values in circuits?
A: Resistance values can range from milliohms (mΩ) in conductors to megaohms (MΩ) in insulators, depending on the material and application.

Q3: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. For semiconductors, resistance typically decreases with temperature.

Q4: What factors affect resistance?
A: Resistance depends on the material's resistivity, length, cross-sectional area, and temperature.

Q5: Can resistance be negative?
A: In passive components, resistance is always positive. Negative resistance can occur in certain active devices under specific conditions.