1. What is the Current Equation?

The current equation (I = P/V) calculates electric current from power and voltage. It's a fundamental relationship in electrical engineering and physics, derived from the definition of electrical power.

2. How Does the Calculator Work?

The calculator uses the current equation:

Where:

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

Explanation: The equation shows that current is directly proportional to power and inversely proportional to voltage.

3. Importance of Current Calculation

Details: Calculating current is essential for circuit design, electrical safety, component selection, and power system analysis.

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 if I get a very high current value?
A: High current may indicate either high power or low voltage. Check your inputs and ensure your circuit can handle the calculated current.

Q2: Does this work for AC and DC circuits?
A: For DC circuits, use directly. For AC circuits, this gives RMS current when using RMS voltage and real power.

Q3: What are typical current values in household circuits?
A: Household circuits typically handle 15-20 amps at 120V (US) or 230V (Europe).

Q4: How does this relate to Ohm's Law?
A: Combined with P = IV, Ohm's Law (V = IR) can derive all relationships between voltage, current, resistance, and power.

Q5: What about three-phase systems?
A: For balanced three-phase systems, use \( I = P / (\sqrt{3} \times V \times pf) \) where pf is power factor.