1. What is Current from Voltage and Watts?

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

Purpose: It helps electricians, engineers, and DIY enthusiasts calculate current flow in electrical circuits when power and voltage are known.

2. How Does the Calculator Work?

The calculator uses Ohm's Law formula:

Where:

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

Explanation: Current is calculated by dividing power by voltage. This represents how many amps are flowing in a circuit with given power at a specific voltage.

3. Importance of Current Calculation

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

4. Using the Calculator

Tips: Enter the power in watts and voltage in volts. Both values must be greater than 0 for the calculation to work.

5. Frequently Asked Questions (FAQ)

Q1: Is this formula valid for both AC and DC circuits?
A: For DC circuits, it works directly. For AC circuits, this gives apparent current - for true current you need to consider power factor.

Q2: What's a typical household voltage?
A: In North America, 120V is standard for most outlets, while 240V is used for large appliances.

Q3: How does current relate to wire size?
A: Higher current requires thicker wires to prevent overheating. Always consult electrical codes for proper sizing.

Q4: Can I calculate power if I know current and voltage?
A: Yes, use P = V × I. We have a separate calculator for this calculation.

Q5: Why is my calculated current higher than expected?
A: Check if you entered power in watts (not kilowatts) and voltage correctly. Also verify if the load is purely resistive.