1. What is the Current Calculation?

The current calculation uses Ohm's Law to determine the electrical current (amperage) drawn by a device when you know its power consumption in watts and the operating voltage.

2. How Does the Calculator Work?

The calculator uses the power formula from Ohm's Law:

Where:

• \( I \) — Current in Amperes (A)
• \( P \) — Power in Watts (W)
• \( V \) — Voltage in Volts (V)

Explanation: The formula shows the direct relationship between power and current, and the inverse relationship between voltage and current.

3. Importance of Current Calculation

Details: Calculating current draw is essential for determining proper wire sizing, circuit breaker selection, and ensuring electrical systems operate safely within their rated capacities.

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: Why is current calculation important?
A: It helps prevent circuit overloads, ensures proper component sizing, and maintains electrical safety in systems.

Q2: What's the difference between AC and DC current calculations?
A: For resistive loads, the calculation is the same. For reactive loads (AC), power factor must be considered.

Q3: How does this relate to circuit breakers?
A: Circuit breakers are rated in amps, so knowing current draw helps select appropriate protection.

Q4: Can I use this for three-phase systems?
A: For three-phase, you'll need to include the power factor (typically 0.8) and use the formula: I = P / (V × √3 × PF).

Q5: What if I know current and want to find power?
A: Rearrange the formula: P = I × V. Multiply current by voltage to get power.