In an AC circuit, how are voltage, current, and impedance related?

In an AC circuit, how are voltage, current, and impedance related?

• A. V = I / Z
• B. V = I + Z
• C. V = I * Z
• D. V = I - Z

Answer: (C)

In an AC circuit, the relationship between voltage (V), current (I), and impedance (Z) is expressed by the formula V = I * Z. This equation illustrates that the voltage across an impedance is directly proportional to the current flowing through it, multiplied by the impedance of the circuit element. Impedance is a complex quantity that encompasses both resistance and reactance, affecting how much current flows for a given voltage. When an AC voltage source is applied, the total opposition to the flow of current is defined as impedance, which takes into account the resistance, inductive reactance, and capacitive reactance. This understanding is crucial when analyzing AC circuits, as it helps in designing and troubleshooting various components in HVAC systems and other electrical applications. Recognizing the direct relationship allows technicians to compute the necessary values to ensure the system operates efficiently and safely without overloads or failures.

In an AC circuit, the relationship between voltage (V), current (I), and impedance (Z) is expressed by the formula V = I * Z. This equation illustrates that the voltage across an impedance is directly proportional to the current flowing through it, multiplied by the impedance of the circuit element.

Impedance is a complex quantity that encompasses both resistance and reactance, affecting how much current flows for a given voltage. When an AC voltage source is applied, the total opposition to the flow of current is defined as impedance, which takes into account the resistance, inductive reactance, and capacitive reactance.

This understanding is crucial when analyzing AC circuits, as it helps in designing and troubleshooting various components in HVAC systems and other electrical applications. Recognizing the direct relationship allows technicians to compute the necessary values to ensure the system operates efficiently and safely without overloads or failures.