1. What is the Amperage from Wattage Formula?

The formula \( I = \frac{P}{V} \) calculates electrical current (amperage) from power (wattage) and voltage. It's a fundamental equation in electrical engineering and physics that relates these three basic electrical quantities.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current in amperes (A)
• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)

Explanation: The formula shows that current is directly proportional to power and inversely proportional to voltage.

3. Importance of Amperage Calculation

Details: Calculating amperage is essential for designing electrical circuits, selecting appropriate wire sizes, choosing circuit breakers, and ensuring electrical safety in both residential and industrial applications.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Can this formula be used for both AC and DC circuits?
A: For DC circuits and AC circuits with purely resistive loads, yes. For AC circuits with reactive components, power factor must be considered.

Q2: What are typical amperage values in household circuits?
A: In North America (120V), common circuits are 15A or 20A. In Europe (230V), typical circuits are 10A or 16A.

Q3: How does wire size relate to amperage?
A: Higher amperage requires thicker wires to prevent overheating. Each wire gauge has a maximum recommended current capacity.

Q4: What happens if current exceeds circuit capacity?
A: The circuit breaker will trip or fuse will blow to prevent overheating and potential fire hazards.

Q5: How do I convert amps to milliamps?
A: Multiply by 1000 (1A = 1000mA). This is useful for small electronic devices.