1. What is the Current Calculation Formula?

The basic formula for calculating current in a DC circuit is I = P/V, where I is current in amperes (amps), P is power in watts, and V is voltage in volts. This is derived from Ohm's Law and the power formula.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

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

Explanation: This formula shows the direct relationship between power, voltage, and current in a DC circuit. For AC circuits, power factor would need to be considered.

3. Importance of Current Calculation

Details: Calculating current is essential for selecting proper wire sizes, circuit breakers, 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: Is this formula valid for AC circuits?
A: This simple formula works for DC circuits. For AC circuits, you need to consider power factor (I = P/(V × PF)).

Q2: What are typical current values for household appliances?
A: Small appliances might draw 1-5 amps, while larger ones like air conditioners can draw 15-20 amps at 120V.

Q3: Why is current calculation important?
A: It helps prevent circuit overloads, ensures proper component selection, and maintains electrical safety.

Q4: How does voltage affect current?
A: For the same power, higher voltage means lower current. This is why power transmission uses high voltages.

Q5: What about three-phase current calculation?
A: Three-phase adds complexity with the √3 factor (I = P/(√3 × V × PF)). This calculator is for simple DC/single-phase cases.