1. What is a Power Calculator?

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

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The product of voltage and current gives the power in watts, representing the rate of energy transfer.

3. Importance of Power Calculation

Details: Accurate power calculations are essential for circuit design, electrical safety, energy efficiency, and proper component selection.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between AC and DC power calculations?
A: For DC, this formula works directly. For AC, you need to consider power factor (P = V × I × PF).

Q2: How do I measure voltage and current?
A: Use a multimeter - set to volts for voltage measurement and amps for current measurement.

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

Q4: Can I calculate current if I know power and voltage?
A: Yes, rearrange the formula: I = P / V

Q5: How does this relate to energy consumption?
A: Energy (kWh) = Power (kW) × Time (hours). This calculator gives the instantaneous power.