# Course: Basics of Electromagnetism

Electricity and Magnetism and their applications
1. 1

## Electric Current: The Most Basic Explanation From a Physics Point of View

In this lesson you will learn the basics of the electric current, i.e. the definition, its physical meaning and unit.

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2. 2

## Voltage: How it is created by charge separation!

Here you will learn what voltage is, how it is generated by charge separation, how a voltage source can be created, and what voltage has to do with current.

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3. 3

## Ohm's law: Formula, Graph and 3 Easy Examples

Here you learn Ohm's law, how it is expressed as a formula and as a graph. We also look at three examples.

Questions & Answers What is the Difference Between an Ohmic and Non-Ohmic Conductor?
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4. 4

## Simple (Series and Parallel) Circuits. The Basics.

Here you will learn how an electrical circuit works and how to apply Ohm's Law to it. You will also learn about parallel and series circuits and their difference.

Questions & Answers What is the Difference between a Series and Parallel Connection of Resistors? What is the Difference Between an Ideal and Practical Voltage Source?
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5. 5

## Ideal and Real Voltage Source

Difference between an ideal and real voltmeter and what effect they have on voltage measurement.

6. 6

## Ideal and real Current Source

What is an ideal and what is a real ammeter? What is the difference between them and what influence they have on current measurement.

7. 7

## Electric Power

Simple derivation of the electric power P, which we express with voltage U and current I and then rewrite using the URI formula.

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8. 8

## What is the Vacuum Permittivity?

What does the electric constant (permittivity of the vacuum) describe and how can I determine it experimentally?

9. 9

## What is the Elementary Charge?

What is the elementary charge e of the electron and proton, what unit does it have and how can I determine it experimentally?

10. 10

## Plate Capacitor: Voltage, Capacitance and Eletric Force

Here the plate capacitor is simply explained. With the help of the capacitor you will learn about the electric voltage, electric field and electric capacitance and how to calculate them for a plate capacitor.

Exercises with solutions Create a Plate Capacitor with a Certain Capacitance Charge in a thundercloud Capacitor with and without dielectric in comparison
Derivations & Experiments

## Plate Capacitor: Potential, E-field, Charge and Capacitance

Here, the electrostatic potential, electric field and the capacitance of a plate capacitor are derived using Laplace's equation.

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11. 11

## What are Equipotential Lines?

What are equipotential lines and equipotential surfaces and what happens to a charge that moves on an equipotential.

12. 12

## RC Circuit: Charging and Discharging a Capacitor

Here you will learn about the RC circuit. This is a resistor and capacitor connected in series. The capacitor can be charged and discharged via the resistor.

Exercises with solutions Charge, Capacitance and Half-Life of a Capacitor When Discharging From 50V to 15V.
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13. 13

## Capacitive reactance of a capacitor

Learn what capacitive reactance is and how to determine it for a capacitor in an AC circuit. We also make a simple example!

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14. 14

## Inductive Reactance of a Coil

Learn what inductive reactance is and how to determine it for a coil in an AC circuit.

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15. 15

## What is the Vacuum Permeability?

What does the magnetic constant (magnetic permeability of the vacuum) describe and how can I determine it experimentally?

16. 16

## Left / Right-Hand Rule: How to Determine Lorentz Force Direction

You learn how to use the hand rule to determine the direction of the Lorentz force and whether you have to use your right or left hand.

17. 17

## Lorentz Force: How to Determine its Direction and Understand Formula

Learn how Lorentz force (magnetic force) deflects a moving charge (electron) in the magnetic field and how you can determine the direction of the deflection.

Exercises with solutions An Ion Orbiting Around The Equator in The Magnetic Field
Derivations & Experiments

## Lorentz Force on Current-Carrying Wires

Derivation of the formulas for the Lorentz force on a current-carrying wire in the magnetic field or Lorentz force between two current-carrying wires.

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18. 18

## Teltron Tube Experiment and How to Get The Specific Charge of a Particle

Here you will learn how a teltron tube experiment is set up, how it visualizes electron motion, and how you can use it to find out specific charge.

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19. 19

## Mass Spectrometer: How to Get the Mass of a Particle?

Here you will learn the simple setup of a mass spectrometer, as well as how it works and the formula for mass and distance from the aperture.

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20. 20

## Hall Effect: A Simple Explanation of How Hall Voltage is Induced

Why does current generate a voltage in a magnetic field? Here you will learn how the Hall effect produces this voltage and how you can determine it.

Derivations & Experiments

## Hall Voltage due to the Hall Effect

Derivation of the Hall voltage (via Hall effect), which depends only on quantities that we can easily determine in an experiment.

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21. 21

## Capacitance - Series and Parallel Connection of Capacitors

Derive the total capacitance (equivalent capacitance) of a parallel circuit and a series circuit of two capacitors in an AC circuit.

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22. 22

## Total (Equivalent) Inductance of a Series and Parallel Circuit of Coils

Derivation of the total inductance (equivalent inductance) of a parallel circuit and series circuit of two coils using the Faraday's law of induction.

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