1. What is an Amperage Calculator?

Definition: This calculator determines the electrical current (amperage) based on power in watts and voltage in volts.

Purpose: It helps electricians, engineers, and DIY enthusiasts calculate current flow in electrical circuits.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

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

Explanation: The power is divided by voltage to determine the current flowing through the circuit.

3. Importance of Amperage Calculation

Details: Proper current calculation ensures correct wire sizing, circuit breaker selection, and electrical safety.

4. Using the Calculator

Tips: Enter the power in watts and voltage in volts (default 120V for standard US household circuits). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between AC and DC in this calculation?
A: The formula works for both, but for AC circuits with reactive loads, power factor must be considered.

Q2: What's a typical household voltage?
A: In the US: 120V for standard outlets, 240V for large appliances. Europe: typically 230V.

Q3: How do I find the power (watts) of a device?
A: Check the device label or specifications. For simple devices: Watts = Volts × Amps.

Q4: Why is amperage important?
A: It determines wire gauge requirements and circuit protection needs to prevent overheating.

Q5: Can I calculate power if I know current and voltage?
A: Yes, using P = V × I. We have a Power Calculator tool for this purpose.