This lecture introduces you to a fundamental law of electronics, Ohm's Law. The law will be stated, and you will be shown the formula discovered by its inventor. There are four handouts which will be used by your instructor throughout the course.
When you have completed this lecture, you will be able to state Ohm's Law and have the handouts you will need to progress through the remaining lectures in this course.
Basic Components of Ohm's Law
There are four fundamental characteristics found in electronic circuits. This lecture, Part 1, and and the next lecture, Part 2, introduce you to the first of these: Voltage. Voltage will be defined, and the difference between DC and AC voltage explained. Voltage sources (things that produce voltage) will be identified and show, and analogies to voltage potential and water and piping systems will be used to assist your understanding of the concept.
You will understand the basic concept of voltage as a result of this presentation.
There are four fundamental characteristics found in electronic circuits. This lecture, Part 2, and and the previous lecture, Part 1, introduce you to the first of these: Voltage. Voltage will be defined, and the difference between DC and AC voltage explained. Voltage sources (things that produce voltage) will be identified and show, and analogies to voltage potential and water and piping systems will be used to assist your understanding of the concept.
You will understand the basic concept of voltage as a result of this presentation.
This lecture, Part 1, and the next lecture, Part 2, will introduce you to Andre-Marie Ampere. His work in early electronics led the name for the unit of current, the ampere, to be named after him. You will be reminded that current flow is the movement of electrons in a conductor, and be shown the difference between Conventional Electron Flow Theory and Electron Flow Theory.
After the upcoming lecture on resistance, you will have the background required to understand and apply the concept of Ohm's Law, and use that law to solve simple electronic circuit problems.
This lecture, Part 2, and the previous lecture, Part 1, will introduce you to Andre-Marie Ampere. His work in early electronics led the name for the unit of current, the ampere, to be named after him. You will be reminded that current flow is the movement of electrons in a conductor, and be shown the difference between Conventional Electron Flow Theory and Electron Flow Theory.
After the upcoming lecture on resistance, you will have the background required to understand and apply the concept of Ohm's Law, and use that law to solve simple electronic circuit problems.
The third of the three concepts required to understand and apply Ohm's Law to electronic circuits resistance, the opposition to current flow. This lecture will introduce that concept and give some examples of how it works, and what resistors look like.
After this lecture, you will be prepared to dive into Ohm's Law and learn the application of this law to solve for unknown quantities in electronic circuits.
The basic form of Ohm's Law, I = ER, can be algebraically manipulated into three forms. Since you will need all three forms in later training, this lecture shows how to derive the three forms.
You will then be ready to perform calculations to solve electronic problems using the appropriate form of the three forms given.
In this first of the three forms of Ohm's Law, you will be given problems where you are given the voltage and resistance in a circuit, and you will be asked to compute and provide the correct amount of current flowing in the circuit.
In this second of the three forms of Ohm's Law, you will be given problems where you are given the voltage and current in a circuit, and you will be asked to compute and provide the correct amount of resistance present in the circuit.
In this third of the three forms of Ohm's Law, you will be given problems where you are given the resistance and current in a circuit, and you will be asked to compute and provide the correct amount of voltage present in the circuit.
In this lecture, you will be shown a simple circuit, with a battery and a light bulb. Your instructor will walk you through exactly what happens when additional voltage is added to the circuit, and how to calculate the new values.
Ohm's Law Example Problems
"What are amps, watts, volts and ohms?" 31 October 2000. HowStuffWorks.com.
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