1. What is the DC Power Formula?

The DC power formula (I = P/V) calculates current (amperes) from power (watts) and voltage (volts) in a direct current circuit. This fundamental relationship is known as Ohm's Law for power calculations.

2. How Does the Calculator Work?

The calculator uses the DC power formula:

Where:

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

Explanation: The current flowing in a DC circuit is equal to the power divided by the voltage. This assumes a power factor of 1 (pure resistive load).

3. Importance of Current Calculation

Details: Calculating current is essential for proper wire sizing, circuit breaker selection, and ensuring electrical systems operate within safe limits.

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: Does this formula work for AC circuits?
A: No, for AC circuits you need to consider power factor (PF) using the formula I = P / (V × PF).

Q2: What's the difference between DC and AC current?
A: DC (Direct Current) flows in one direction constantly, while AC (Alternating Current) changes direction periodically.

Q3: How do I convert amps to watts?
A: Use the inverse formula: P = I × V (for DC circuits).

Q4: What are typical voltage values for DC systems?
A: Common DC voltages include 12V (automotive), 24V (industrial), 48V (telecom), and higher for solar systems.

Q5: Why is wire size important for current?
A: Higher currents require thicker wires to prevent overheating and voltage drop over distance.