Power to Voltage Calculator
Unit Converter ▲
Unit Converter ▼
From:  To: 
The ability to convert power (in watts) to voltage (in volts) through a known resistance (in ohms) is a fundamental aspect of electrical engineering and physics. This conversion is vital in designing and analyzing electrical circuits, ensuring compatibility and efficiency across different components.
Historical Background
The relationship between power, voltage, and resistance is rooted in Ohm's Law and the Power Law, fundamental principles in electrical engineering. These laws facilitate the understanding of electrical circuits and the interaction between their various components.
Calculation Formula
The formula for calculating voltage from power is derived from the combination of Ohm's Law and the Power Law:
\[ V = \sqrt{P \times R} \]
Where:
 \(V\) represents the voltage in volts (V),
 \(P\) is the total power in watts (W),
 \(R\) is the total resistance in ohms (Ω).
Example Calculation
To illustrate, consider a circuit where the total power is 50 watts and the total resistance is 4 ohms. The voltage can be calculated as:
\[ V = \sqrt{50 \times 4} = \sqrt{200} \approx 14.14 \text{ volts} \]
Importance and Usage Scenarios
This calculation is crucial in many electrical engineering applications, including designing power supplies, determining the voltage required for specific power outputs, and troubleshooting electrical circuits.
Common FAQs

What is Ohm's Law?
 Ohm's Law states the relationship between voltage, current, and resistance in an electrical circuit: \(V = I \times R\).

How does power relate to voltage and resistance?
 Power in an electrical circuit can be expressed as \(P = V^2 / R\) or \(P = I^2 \times R\), linking it directly to voltage and resistance.

Can I calculate current if I know the power and resistance?
 Yes, current can be calculated using the formula \(I = \sqrt{P / R}\), derived from the power formula and Ohm's Law.
Understanding these concepts allows for the efficient design and operation of electrical circuits, ensuring that they meet the required performance criteria while maintaining safety standards.