Power in Electrical Circuits

📊 beginner

$$P = VI$$

The rate at which electrical energy is transferred by an electric circuit.

Variables & Units

$P$

Electric Power

Unit: Watt ($W$)

$V$

Voltage

Unit: Volt ($V$)

$I$

Electric Current

Unit: Ampere ($A$)

Key Information

📐 Derived From

Definition of power $P = W/t$ and $V = W/Q$.

💡 Example

A $120 V$ appliance drawing $10 A$ uses $1200 W$.

🔧 Applications

Electrical grid planning and home appliance safety.

⚠️ Constraints

For DC circuits or resistive AC circuits.

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