1. What is the Power Formula?

The power formula (I = P/V) calculates electrical current in amperes (A) from power in watts (W) and voltage in volts (V). This is a fundamental equation in electrical engineering and physics.

2. How Does the Calculator Work?

The calculator uses the power equation:

Where:

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

Explanation: The equation shows the direct relationship between power and voltage in determining current flow in an electrical circuit.

3. Importance of Current Calculation

Details: Calculating current is essential for circuit design, selecting proper wire gauges, determining fuse/breaker sizes, and ensuring electrical safety.

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: What's the difference between AC and DC in this calculation?
A: The formula works for both AC and DC, but for AC circuits with reactive components, you would need to consider power factor.

Q2: What are typical household current values?
A: In North America, typical household circuits are 15A or 20A at 120V. Large appliances may use 240V circuits.

Q3: How does this relate to Ohm's Law?
A: This is a variation of Ohm's Law when power is known instead of resistance (P = IV → I = P/V).

Q4: What if I know resistance instead of power?
A: Use Ohm's Law directly: I = V/R where R is resistance in ohms.

Q5: How accurate is this calculation?
A: The calculation is mathematically precise for DC circuits or AC circuits with purely resistive loads.