What formula is used to calculate voltage in a circuit?

What formula is used to calculate voltage in a circuit?

• A. E = I x R
• B. V = R / I
• C. V = I + R
• D. E = R / I

Answer: (A)

The formula E = I x R correctly represents Ohm's Law, which describes the relationship between voltage (E), current (I), and resistance (R) in a circuit. In this formula, voltage is equal to the current flowing through a conductor multiplied by the resistance of that conductor. This foundational principle is crucial for understanding how electrical circuits function; it allows for the calculation of voltage when current and resistance are known. For instance, if you know the current flowing through a resistor and the resistance it has, you can easily determine the voltage drop across that resistor using this formula. This is essential for designing and troubleshooting circuits, as it helps ensure that components operate within their specified voltage ratings.

The formula E = I x R correctly represents Ohm's Law, which describes the relationship between voltage (E), current (I), and resistance (R) in a circuit. In this formula, voltage is equal to the current flowing through a conductor multiplied by the resistance of that conductor. This foundational principle is crucial for understanding how electrical circuits function; it allows for the calculation of voltage when current and resistance are known.

For instance, if you know the current flowing through a resistor and the resistance it has, you can easily determine the voltage drop across that resistor using this formula. This is essential for designing and troubleshooting circuits, as it helps ensure that components operate within their specified voltage ratings.