Certified Energy Manager Practice Exam

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How are harmonics typically produced in an electrical system?

By high voltage transmission lines
Through nonlinear loads such as computers
From reactive power mismatches
By overhead power cables

The correct answer is: Through nonlinear loads such as computers

Harmonics in an electrical system are primarily produced by nonlinear loads, such as computers, printers, and variable frequency drives. Nonlinear loads draw current in a non-sinusoidal manner, which distorts the voltage and current waveforms and results in the generation of harmonics. This distortion is a byproduct of the way these devices convert electrical energy into usable power, often during the rectification or switching processes. When nonlinear loads operate, they create harmonic currents that can interfere with the power quality of the electrical system, leading to potential issues like overheating of electrical equipment, increased losses in electrical components, and interference with communication lines. Therefore, understanding the role of nonlinear loads in harmonic production is crucial for managing and mitigating harmonic distortions in electrical systems.