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Voltage Equation:
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The voltage equation (V = W / A) calculates the electrical potential difference (voltage) by dividing the power in watts by the current in amperes. This fundamental relationship is derived from Ohm's Law and is essential in electrical engineering and circuit design.
The calculator uses the voltage equation:
Where:
Explanation: The equation shows the direct relationship between power and voltage when current is known. It's particularly useful for determining the voltage required for a given power at a specific current.
Details: Accurate voltage calculation is crucial for designing electrical circuits, selecting appropriate components, and ensuring safe operation of electrical devices. It helps prevent overvoltage conditions that could damage equipment.
Tips: Enter power in watts and current in amperes. Both values must be positive numbers. The calculator will compute the corresponding voltage in volts.
Q1: Can this equation be used for both AC and DC circuits?
A: For DC circuits, this equation applies directly. For AC circuits, it applies to apparent power (VA) when using RMS values for voltage and current.
Q2: What if I know voltage and want to find wattage?
A: You can rearrange the equation: W = V × A. Multiply voltage by current to get power.
Q3: How does resistance factor into this?
A: Using Ohm's Law (V = I × R), you can substitute to get power equations: W = I² × R or W = V² / R.
Q4: What are typical household voltages?
A: In North America, 120V is standard for most outlets, while 240V is used for large appliances. Other regions commonly use 230V.
Q5: Why is my calculated voltage different from measured voltage?
A: Real-world factors like resistance, power factor (in AC), and efficiency losses can cause differences between calculated and actual values.