1. What is the DC Power Equation?

The DC power equation (P = V × I) calculates the power in watts (W) in a direct current (DC) electrical circuit by multiplying the voltage (V) in volts by the current (I) in amperes.

2. How Does the Calculator Work?

The calculator uses the DC power equation:

Where:

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

Explanation: This fundamental equation shows that power is directly proportional to both voltage and current in a DC circuit.

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical circuits, selecting appropriate components, determining energy consumption, and ensuring safety in electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts and current in amperes. Both values must be positive numbers. The calculator will compute the power in watts.

5. Frequently Asked Questions (FAQ)

Q1: Does this equation work for AC circuits?
A: No, this simple form only works for DC circuits. AC power calculations require considering power factor for accurate results.

Q2: What are typical voltage and current values?
A: Common DC voltages range from 1.5V (batteries) to 12V/24V (automotive) to 48V (telecom). Current depends on the load.

Q3: How does power relate to energy?
A: Power is the rate of energy transfer. Energy (in watt-hours) = Power × Time.

Q4: What affects power in a circuit?
A: Power depends on both voltage and current. Changing either will affect the power output.

Q5: How is this used in real applications?
A: Used to size wires, select fuses, design power supplies, calculate battery life, and determine component ratings.