1. What is a Watts Calculator (P = V × I)?

Definition: This calculator computes electrical power in watts based on voltage and current using Ohm's Law.

Purpose: It helps electricians, engineers, and DIY enthusiasts determine power consumption or generation in electrical circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: Electrical power is simply the product of voltage and current in a circuit.

3. Importance of Power Calculation

Details: Accurate power calculations are essential for circuit design, energy efficiency, and proper sizing of electrical components.

4. Using the Calculator

Tips: Enter the voltage in volts and current in amps. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between watts, volts, and amps?
A: Volts measure electrical potential, amps measure current flow, and watts measure power (the rate of energy transfer).

Q2: Can I calculate any two values if I know the third?
A: Yes! This is Ohm's Law. You can calculate:

• P = V × I (power)
• V = P ÷ I (voltage)
• I = P ÷ V (current)

Q3: What's a typical household voltage?
A: In North America, 120V for standard outlets and 240V for large appliances. Europe uses 230V.

Q4: How does this relate to energy bills?
A: Energy companies charge by kilowatt-hours (kWh), which is power (kW) × time (hours).

Q5: What about AC vs DC power?
A: For DC circuits, use the simple formula. For AC, you must consider power factor (cos φ).