Heating, Ventilation, and Air Conditioning (HVAC ) Electrical Practice Test

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How can voltage be calculated in an electrical circuit?

V = R x I
V = E x R
V = I / R
V = I x R

The correct answer is: V = I x R

The correct reasoning behind calculating voltage in an electrical circuit using the formula V = I x R lies in Ohm's Law, which is a fundamental concept in electrical engineering and HVAC practices. According to Ohm’s Law, voltage (V) across a component in a circuit is the product of the current (I) flowing through the component and its resistance (R). This relationship indicates that if you know the current in amperes and the resistance in ohms, you can easily determine the voltage in volts. For example, if a circuit has a current of 2 amperes flowing through a resistor with a resistance of 5 ohms, the voltage across the resistor would be calculated as V = 2 A x 5 Ω = 10 V. Recognizing this relationship is crucial for troubleshooting and designing electrical systems within HVAC applications, ensuring that equipment operates correctly under safe voltage levels.