Free Course Image Electrical basics class

Free online course Electrical basics class

Duration of the online course: 1 hours and 14 minutes

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Build real electrician skills fast with a free online course on electrical basics—resistance, capacitance, AC motors, and safer circuit decisions. Certificate-ready.

In this free course, learn about

  • Core electrical principles: voltage, current, resistance, power and basic circuit behavior
  • Purpose of capacitors in AC motors, including start/run roles and phase shifting
  • Primary purpose of a capacitor in an AC motor circuit (improving starting torque/operation)
  • Primary function of a capacitor in an AC circuit (energy storage and reactive effects)
  • SI unit of capacitance: the farad (F)
  • Effect of adding resistors in series: total resistance increases, current decreases
  • Impact on circuit wattage/power with added series resistance (typically decreases at fixed voltage)
  • Unit of electrical resistance: the ohm (Ω)

About the free online course

Understanding electricity is a career advantage whether you are starting in the trades or you already work around equipment and want more confidence on the job. This free online course builds a strong foundation in electrical basics with clear, practical explanations that connect core theory to everyday work an electrician encounters. You will develop the ability to reason through circuit behavior instead of guessing, which helps you troubleshoot faster, avoid costly mistakes, and make safer decisions.

You will strengthen your grasp of fundamental concepts like electrical resistance and how it is measured, then connect those ideas to real circuit outcomes. For example, you will learn how changing resistance in a series circuit affects current flow and the power dissipated in the system, an essential insight when evaluating loads, selecting components, or diagnosing a circuit that is running hot, dim, or underperforming. This kind of reasoning supports better planning and reduces risk when equipment behaves differently after modifications.

The course also clarifies capacitance in a way that feels relevant to the field. You will learn the SI unit of capacitance and what capacitors actually do in circuits, with special attention to AC motor applications. Capacitors are common points of confusion in maintenance and installation work, yet they are central to how many single-phase motors start and run. By understanding their purpose and function, you will be better prepared to identify symptoms of capacitor-related failures, communicate clearly with teammates or clients, and choose appropriate replacements when required.

Throughout the course, the emphasis stays on building solid professional skills that transfer to many electrician tasks: reading a situation, predicting electrical behavior, and validating what you see with the correct units and principles. If you are preparing for entry-level opportunities, brushing up for workplace responsibilities, or simply want a reliable refresher on essentials, this course gives you a practical, confidence-building starting point you can apply immediately.

Course content

  • Video class: Electrical Basics Class 1h14m
  • Exercise: What is the purpose of a capacitor in an AC electric motor?
  • Exercise: What is the SI unit of capacitance?
  • Exercise: In an electrical circuit, if you add more resistors in series, what happens to the overall current and wattage of the circuit?
  • Exercise: What is the primary purpose of a capacitor in an AC motor circuit?
  • Exercise: What is the primary function of a capacitor in an AC circuit?
  • Exercise: What is the unit of electrical resistance?

This free course includes:

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1 hours and 14 minutes of online video course

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Digital certificate of course completion (Free)

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Exercises to train your knowledge

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100% free, from content to certificate

What does a capacitor do in an AC electric motor?

It creates a phase shift that helps produce starting torque and improves motor operation.

What is the SI unit of capacitance?

The SI unit of capacitance is the farad (F).

What happens when resistors are added in series?

Total resistance increases, so circuit current and total wattage decrease at a fixed voltage.

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Course comments: Electrical basics class

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David Jester

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Great course for beginners, I learned a lot! Thank you!

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