1. What is Ohm's Law Calculator?

Definition: This calculator determines the resistance (R) in ohms using Ohm's Law, based on voltage (V) and current (I) values.

Purpose: It helps electrical engineers, technicians, and hobbyists calculate the required resistance for circuits.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

• \( R \) — Resistance (ohms)
• \( V \) — Voltage (volts)
• \( I \) — Current (amps)

Explanation: The voltage is divided by current to determine the resistance in a circuit.

3. Importance of Resistance Calculation

Details: Proper resistance calculation ensures circuit safety, proper component selection, and desired electrical characteristics.

4. Using the Calculator

Tips: Enter the voltage in volts and current in amps. Current must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: What if I know resistance and want to find voltage or current?
A: Use the other forms of Ohm's Law: \( V = I \times R \) or \( I = \frac{V}{R} \).

Q2: What are typical voltage values?
A: Common voltages include 1.5V (batteries), 5V (USB), 12V (automotive), 120V/240V (household).

Q3: Why can't current be zero?
A: Division by zero is undefined. In real circuits, current must flow for resistance to be meaningful.

Q4: How precise should my measurements be?
A: For most applications, 2-3 decimal places are sufficient. High-precision circuits may need more.

Q5: Does this work for AC and DC circuits?
A: This calculator works for DC circuits. For AC, impedance calculations are more complex.