1. What is Limiting Resistance?

Limiting resistance is the minimum resistance required in a circuit to limit the current to a safe value for components, calculated using Ohm's Law (R = V/I).

2. How Does the Calculator Work?

The calculator uses the Ohm's Law equation:

Where:

• \( R \) — Resistance in ohms (Ω)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)

Explanation: The equation shows that resistance is directly proportional to voltage and inversely proportional to current.

3. Importance of Resistance Calculation

Details: Calculating limiting resistance is crucial for circuit design to prevent component damage, ensure proper operation, and maintain safety standards.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. All values must be positive numbers. The calculator will compute the required resistance to limit current to the specified value at the given voltage.

5. Frequently Asked Questions (FAQ)

Q1: What happens if resistance is too low?
A: Too low resistance can cause excessive current flow, potentially damaging components or causing overheating.

Q2: How do I choose appropriate voltage and current values?
A: Voltage is typically your power supply voltage. Current should be the maximum safe current for your component.

Q3: Does this work for AC circuits?
A: For purely resistive AC circuits, yes. For circuits with reactance, impedance calculations are needed.

Q4: What about power rating of the resistor?
A: This calculator gives resistance value. You must also ensure the resistor can handle the power (P = I²R).

Q5: Can I use this for LED current limiting?
A: Yes, but subtract the LED's forward voltage from the supply voltage first (R = (Vsupply - Vled)/I).