1. What is the Current Formula?

The formula I = P/V calculates electrical current (in amperes) from power (in watts) and voltage (in volts). This fundamental electrical equation is derived from Ohm's Law and is essential for electrical circuit analysis and design.

2. How Does the Calculator Work?

The calculator uses the current formula:

Where:

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

Explanation: This formula shows the direct relationship between power and current, and the inverse relationship between voltage and current for a given power level.

3. Importance of Current Calculation

Details: Accurate current calculation is crucial for electrical system design, circuit protection, wire sizing, and ensuring electrical devices operate within their specified limits.

4. Using the Calculator

Tips: Enter power in watts and voltage in volts. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between AC and DC current calculation?
A: For resistive loads, the formula works for both AC and DC. For reactive loads (inductive or capacitive), power factor must be considered in AC circuits.

Q2: How does this relate to Ohm's Law?
A: This formula is derived from the power formula P = VI, which is related to Ohm's Law (V = IR) through the relationship P = I²R = V²/R.

Q3: When is this calculation most useful?
A: This calculation is essential for determining circuit requirements, selecting appropriate fuses or breakers, and ensuring electrical safety in various applications.

Q4: Are there limitations to this formula?
A: The formula assumes purely resistive loads. For reactive loads, the apparent power (VA) differs from real power (watts), requiring power factor correction.

Q5: How accurate is this calculation?
A: The calculation is mathematically precise for the given inputs. Accuracy depends on the precision of the power and voltage measurements used.