1. What is Electrical Power?

Electrical power is the rate at which electrical energy is transferred by an electric circuit. It is measured in watts (W) and represents the amount of energy consumed or produced per unit time.

2. How Does the Calculator Work?

The calculator uses the electrical power formula:

Where:

• \( P \) — Electrical power (watts)
• \( V \) — Voltage (volts)
• \( R \) — Resistance (ohms)

Explanation: This formula calculates power dissipation in a resistive circuit using voltage and resistance values.

3. Importance of Power Calculation

Details: Accurate power calculation is essential for circuit design, energy efficiency analysis, electrical safety assessments, and proper component selection in electrical systems.

4. Using the Calculator

Tips: Enter voltage in volts and resistance in ohms. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What are the units for electrical power?
A: Electrical power is measured in watts (W), where 1 watt = 1 joule per second.

Q2: Can this formula be used for AC circuits?
A: This specific formula (P = V²/R) is primarily for DC circuits with pure resistance. For AC circuits, power factor must be considered.

Q3: What is the relationship between power, voltage and current?
A: Power can also be calculated as P = V × I (voltage times current) or P = I² × R (current squared times resistance).

Q4: Why does power increase with voltage squared?
A: Because both current (I = V/R) and voltage contribute to power (P = V × I), resulting in the squared relationship P = V²/R.

Q5: What are typical power values in household appliances?
A: Household appliances range from few watts (LED bulbs) to thousands of watts (heaters, air conditioners). Most devices have power ratings labeled on them.