1. What is Ohm's Law?

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points. It provides the mathematical relationship between voltage, current, and resistance in an electrical circuit.

2. How Does the Calculator Work?

The calculator uses the Ohm's Law equation:

Where:

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

Explanation: The equation shows that resistance equals voltage divided by current. Higher voltage with the same current means higher resistance.

3. Importance of Ohm's Law

Details: Ohm's Law is fundamental for analyzing electrical circuits, designing electronic components, and troubleshooting electrical systems. It's essential for engineers, electricians, and anyone working with electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers. The calculator will compute the resistance in ohms.

5. Frequently Asked Questions (FAQ)

Q1: What are typical voltage values?
A: Common voltages include 1.5V (batteries), 5V (USB), 12V (car batteries), 120V (US outlets), and 230V (European outlets).

Q2: What are typical current values?
A: Small electronics might use milliamps (mA), while household appliances might use several amps. Circuit breakers typically handle 15-20A.

Q3: When does Ohm's Law not apply?
A: Ohm's Law applies to "ohmic" materials. Some components like diodes and transistors are non-ohmic, especially at different temperatures.

Q4: How does resistance affect a circuit?
A: Higher resistance reduces current flow for a given voltage, which can protect components but may also reduce performance.

Q5: Can I calculate power with this?
A: While this calculator focuses on resistance, power (P) can be calculated as P = V × I (watts).