1. What is Ohm's and Watt's Law?

Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points and inversely proportional to the resistance between them. Watt's Law describes the relationship between power, voltage, and current in an electrical circuit.

2. How Does the Calculator Work?

The calculator uses the power formula derived from Ohm's and Watt's Laws:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( R \) — Resistance in ohms (Ω)

Explanation: This formula calculates the power dissipated in a resistive component when voltage and resistance are known.

3. Importance of Power Calculation

Details: Calculating power is essential for designing electrical circuits, selecting appropriate components, ensuring safety, and optimizing energy efficiency in electronic 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 other forms of the power formula?
A: Power can also be calculated as P = V × I (voltage times current) or P = I² × R (current squared times resistance).

Q2: What is the relationship between Ohm's Law and Watt's Law?
A: Watt's Law is derived from Ohm's Law. By substituting I = V/R from Ohm's Law into P = V × I, we get P = V²/R.

Q3: When should I use this specific formula?
A: Use P = V²/R when you know the voltage across a component and its resistance, but not the current flowing through it.

Q4: Are there limitations to this formula?
A: This formula applies specifically to resistive loads in DC circuits. For AC circuits with reactive components, additional factors like power factor must be considered.

Q5: What are typical power values in electronic circuits?
A: Power values can range from microwatts (μW) in small electronic devices to kilowatts (kW) in power systems, depending on the application.