Free Course Image Electrical engineering

Free online course Electrical engineering

Duration of the online course: 11 hours and 53 minutes

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Build real circuit-solving skills in this free electrical engineering course—learn voltage, current, Ohm’s law, and Kirchhoff rules for job-ready confidence.

In this free course, learn about

  • Atomic structure basics used in EE (e.g., atomic number of copper)
  • Definition of electric current and its units; relation to charge flow
  • Voltage (electric potential difference) and its everyday analogy from the video
  • Conventional vs electron current; conventional current direction in circuits
  • Ideal circuit elements and Ohm’s law for resistors (V = IR)
  • Ideal voltage vs ideal current sources and how their I–V plots differ
  • Circuit terminology: nodes, branches, loops, and reference directions
  • Passive sign convention: how to assign current/voltage polarities for elements
  • Series resistors: equivalent resistance and solving numeric series examples
  • Parallel resistors: equivalent resistance formulas, including equal-resistor case
  • Simplifying resistor networks using series/parallel reduction techniques
  • Voltage divider rule to compute output voltage from resistors and input voltage
  • Kirchhoff’s Current Law (KCL) and Kirchhoff’s Voltage Law (KVL) applications
  • Node-voltage method: choosing a reference node and writing KCL equations

About the free online course

Strengthen your professional electrician skillset by learning how to think like an electrical engineer when you face real circuits. This free online course builds the foundations that help you move from memorizing rules to understanding what is happening in a circuit, so you can troubleshoot faster, communicate more clearly, and make safer, more reliable decisions on the job or in further study.

You will connect key ideas such as charge, atomic structure, current, and voltage, then see how those concepts become practical tools for circuit analysis. Instead of treating formulas as magic, you will develop intuition for what voltage represents, how current direction is defined in practice, and why conventions matter when you read schematics, calculate power, or interpret measurements. Along the way, you’ll get comfortable with sign conventions for passive components so your calculations stay consistent and your results make sense.

The course focuses on the core building blocks used everywhere in electrical work: ideal resistors and sources, and the laws that govern networks of components. You’ll learn to reason through series and parallel combinations, simplify resistor networks, and use classic approaches like the voltage divider to predict outputs with confidence. By practicing with targeted questions and problem-solving exercises, you’ll reinforce not only the correct equations but also the decision-making process behind choosing them.

As you progress, you’ll apply Kirchhoff’s Current Law and Kirchhoff’s Voltage Law to analyze more complex circuits, including multi-source scenarios, and you’ll see how to set up and solve for unknown currents and voltages. The learning experience also introduces a structured approach to solving circuits using node voltage methods, giving you a repeatable workflow you can bring to new problems—whether you are studying for exams, preparing for an entry-level role, or leveling up your electrical troubleshooting skills.

By the end, you should feel more fluent in circuit terminology, more confident translating diagrams into equations, and better prepared to tackle everyday electrical questions with clarity and accuracy. If you want a practical, beginner-friendly path into electrical engineering concepts with hands-on practice, this course is designed to help you build that foundation step by step.

Course content

  • Video class: Current | Introduction to electrical engineering | Electrical engineering | Khan Academy 09m
  • Exercise: What is the atomic number of copper?
  • Video class: Voltage | Introduction to electrical engineering | Electrical engineering | Khan Academy 02m
  • Exercise: What is voltage analogous to in the video explanation?
  • Video class: Current direction | Electrical engineering | Khan Academy 05m
  • Exercise: What is the conventional direction assigned to electric current?
  • Video class: Conventional current 03m
  • Exercise: What is the conventional current direction?
  • Video class: Ideal circuit elements | Circuit analysis | Electrical engineering | Khan Academy 06m
  • Exercise: Which equation represents Ohm's Law for a resistor?
  • Video class: Ideal sources | Circuit analysis | Electrical engineering | Khan Academy 02m
  • Exercise: What is the main difference between an ideal voltage source and an ideal current source in terms of an IV plot?
  • Video class: Circuit terminology | Circuit analysis | Electrical engineering | Khan Academy 08m
  • Exercise: What is a node in a circuit?
  • Video class: Sign convention for passive components | Electrical engineering | Khan Academy 04m
  • Exercise: Which direction does the current go in passive components using the sign convention?
  • Video class: Series resistors | Circuit analysis | Electrical engineering | Khan Academy 11m
  • Exercise: What is the equivalent resistance of three resistors in series with values 100 ohms, 50 ohms, and 150 ohms?
  • Video class: Parallel resistors (part 1) | Circuit analysis | Electrical engineering | Khan Academy 11m
  • Exercise: What is the equivalent resistance of two resistors in parallel?
  • Video class: Parallel resistors (part 2) | Circuit analysis | Electrical engineering | Khan Academy 04m
  • Exercise: How do you calculate the equivalent resistance of multiple parallel resistors?
  • Video class: Parallel resistors (part 3) | Circuit analysis | Electrical engineering | Khan Academy 09m
  • Exercise: What is the parallel combination of two resistors in the special case where they have the same resistance value?
  • Video class: Simplifying resistor networks | Circuit analysis | Electrical engineering | Khan Academy 08m
  • Exercise: What is the equivalent resistance of the given circuit?
  • Video class: Voltage divider | Circuit analysis | Electrical engineering | Khan Academy 06m
  • Exercise: What is the voltage output of a voltage divider with specific resistors and input voltage?
  • Video class: Analyzing a resistor circuit with two batteries | Electrical engineering | Khan Academy 09m
  • Exercise: What is the current through the third resistor in the circuit?
  • Video class: Kirchhoff's current law | Circuit analysis | Electrical engineering | Khan Academy 06m
  • Exercise: What does Kirchhoff's Current Law state about a node in an electrical circuit?
  • Video class: Kirchhoff's voltage law | Circuit analysis | Electrical engineering | Khan Academy 06m
  • Exercise: What is Kirchhoff's Voltage Law (KVL)?
  • Video class: Application of the fundamental laws (setup) | Electrical engineering | Khan Academy 08m
  • Exercise: In circuit analysis, which law states that the sum of the voltages around a loop is zero?
  • Video class: Application of the fundamental laws (solve) | Electrical engineering | Khan Academy 08m
  • Exercise: What is the value of i1 in the circuit analysis?
  • Video class: Node voltage method (steps 1 to 4) | Circuit analysis | Electrical engineering | Khan Academy 09m
  • Exercise: What is a key step in the Node Voltage Method?
  • Video class: Node voltage method (step 5) | Circuit analysis | Electrical engineering | Khan Academy 06m
  • Video class: Mesh current steps 1 to 3 09m
  • Video class: Mesh current method (step 4 solve) 12m
  • Video class: Capacitor i-v equations 08m
  • Video class: A capacitor integrates current 09m
  • Video class: RC natural response intuition (1 of 3) 07m
  • Video class: RC natural response derivation (2 of 3) 10m
  • Video class: RC natural response example (3 of 3) 02m
  • Video class: Sketching exponentials 07m
  • Video class: Sketching exponentials - examples 07m
  • Video class: RC step response - intuition 10m
  • Video class: RC step response 1 of 3 setup 09m
  • Video class: RC step response 2 of 3 solve 09m
  • Video class: RC step response 3 of 3 example 03m
  • Video class: Coulomb's Law | Electrostatics | Electrical engineering | Khan Academy 11m
  • Video class: Electric potential energy | Electrostatics | Electrical engineering | Khan Academy 12m
  • Video class: Proof: Field from infinite plate (part 1) | Electrostatics | Electrical engineering | Khan Academy 13m
  • Video class: Proof: Field from infinite plate (part 2) | Electrostatics | Electrical engineering | Khan Academy 11m
  • Video class: What is an operational amplifier? 11m
  • Video class: Non-inverting op-amp circuit 12m
  • Video class: Feedback 05m
  • Video class: Inverting op-amp circuit 12m
  • Video class: Virtual ground 05m
  • Video class: Inverting and unity-gain op-amp with virtual ground 06m
  • Video class: Summing op-amp circuit 09m
  • Video class: LC natural response intuition 1 05m
  • Video class: LC natural response intuition 2 09m
  • Video class: LC natural response derivation 1 06m
  • Video class: LC natural response derivation 2 09m
  • Video class: LC natural response derivation 3 07m
  • Video class: LC natural response derivation 4 07m
  • Video class: LC natural response example 07m
  • Video class: AC analysis intro 1 06m
  • Video class: AC analysis intro 2 08m
  • Video class: Trigonometry review 07m
  • Video class: Sine and Cosine come from circles 04m
  • Video class: Sine of time 10m
  • Video class: Sine and cosine from rotating vector 03m
  • Video class: Lead Lag 07m
  • Video class: Complex numbers 08m
  • Video class: Multiplying by j is rotation 06m
  • Video class: Eulers formula 08m
  • Video class: Eulers formula magnitude 06m
  • Video class: Complex exponentials spin 06m
  • Video class: Eulers sine wave 03m
  • Video class: Euler's cosine wave 03m
  • Video class: Negative frequency 06m
  • Video class: Impedance 11m
  • Video class: AC analysis superposition 07m
  • Video class: Complex rotation 06m
  • Video class: Impedance vs frequency 08m
  • Video class: Inductor equations 12m
  • Video class: Inductor kickback 1 of 2 12m
  • Video class: Inductor kickback 2 of 2 07m
  • Video class: Diode 11m
  • Video class: Diode graphical solution 08m
  • Video class: Fourier Series introduction 05m
  • Video class: Definite integrals of sin(mx) and cos(mx) 06m
  • Video class: Definite integral of sine and cosine product 04m
  • Video class: Definite integrals of product of sines 08m
  • Video class: Integral of product of cosines 07m
  • Video class: Formula for first term in Fourier Series 06m
  • Video class: Fourier series coefficients for cosine terms 06m
  • Video class: Fourier coefficients for sine terms 06m
  • Video class: Finding Fourier coefficients for square wave 10m
  • Video class: Visualizing Fourier expansion of square wave 03m
  • Video class: ELI the ICE man 10m
  • Video class: KVL in the frequency domain 14m
  • Video class: Impedance of simple networks 11m

This free course includes:

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11 hours and 53 minutes of online video course

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Digital certificate of course completion (Free)

Icon for exercises to practice what you've learned

Exercises to train your knowledge

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100% free, from content to certificate

How do you calculate equivalent resistance for resistors in series and parallel?

In series, add the resistances: Rtotal = R1 + R2 + … . In parallel, add reciprocals: 1/Rtotal = 1/R1 + 1/R2 + … .

What is the difference between conventional current direction and electron flow?

Conventional current is defined as flowing from positive to negative, while electrons physically move from negative to positive.

What do Kirchhoff’s Current Law and Voltage Law state?

KCL says total current entering a node equals total current leaving it. KVL says the algebraic sum of voltages around any closed loop is zero.

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Course comments: Electrical engineering

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manjunatha dr

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god coaching and explanation

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sondra york

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very well put together.

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Yajnananda Yajju

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good

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