Average Power (DC)

📊 beginner

$$P = VI = I^2R = \frac{V^2}{R}$$

The rate at which electrical energy is converted into other forms (like heat).

Variables & Units

$P$

Electrical Power

Unit: Watt ($W$)

Key Information

📐 Derived From

Work done by electric field $W = qV$ and $I = q/t$.

💡 Example

Power used by a $12V$ car headlight with $2A$ current.

🔧 Applications

Appliance rating and resistor thermal design.

⚠️ Constraints

Steady DC voltage and current.

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