1. What is Ohm's Law Calculator?

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

Purpose: It helps electricians, engineers, and hobbyists calculate resistance in electrical circuits.

2. How Does the Calculator Work?

The calculator uses the 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 Ohm's Law

Details: Ohm's Law is fundamental for designing electrical circuits, selecting proper components, and troubleshooting electrical systems.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What if I know resistance and want to find voltage or current?
A: You can rearrange the formula: \( V = I \times R \) or \( I = \frac{V}{R} \).

Q2: Does this work for AC and DC circuits?
A: This calculator works for DC circuits. For AC circuits, impedance calculations are more complex.

Q3: What's a typical voltage for household circuits?
A: In North America, 120V is standard for most outlets, 240V for large appliances.

Q4: How do I measure current safely?
A: Always use a properly rated multimeter and follow electrical safety procedures.

Q5: Why does my calculated resistance not match the resistor color code?
A: Components may have manufacturing tolerances (typically 5-10%), or there may be other factors affecting your measurement.