Electrician Red Seal · Question
A technician is troubleshooting a circuit with a resistive load and a small series inductor. If the supply frequency is increased, what will be the effect on the total impedance of the circuit?
The inductive reactance (XL) of an inductor is directly proportional to the supply frequency (XL = 2πfL). If the frequency increases, XL increases. Since the to
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Question: A technician is troubleshooting a circuit with a resistive load and a small series inductor. If the supply frequency is increased, what will be the effect on the total impedance of the circuit?
Answer options:
- The total impedance will decrease.
- The total impedance will remain unchanged. ✅ The total impedance will increase.
- The total impedance will become purely resistive.
Correct answer: The total impedance will increase.
Explanation: The inductive reactance (XL) of an inductor is directly proportional to the supply frequency (XL = 2πfL). If the frequency increases, XL increases. Since the total impedance (Z) for an RL series circuit is Z = √(R² + XL²), an increase in XL will lead to an increase in the total impedance of the circuit.
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