1. What is a Power Calculator?

Definition: This calculator computes electrical power using voltage and current values.

Purpose: It helps electrical engineers, technicians, and hobbyists determine power consumption in circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: Power is calculated by multiplying the voltage across a component by the current flowing through it.

3. Importance of Power Calculation

Details: Accurate power calculations are essential for circuit design, energy efficiency, and selecting appropriate 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 units does this calculator use?
A: The calculator uses volts for voltage, amps for current, and outputs power in watts.

Q2: Can I use this for AC circuits?
A: This calculates real power for DC circuits. For AC, you'd need to consider power factor.

Q3: What's a typical voltage for household circuits?
A: In North America, 120V is standard, while many other countries use 230V.

Q4: How do I measure current safely?
A: Always use a properly rated multimeter and follow electrical safety procedures.

Q5: What if I know resistance instead of current?
A: Use our Ohm's Law Calculator which can calculate power from voltage and resistance.