ytdivine:
What do you know about an inductor. An inductor is a passive electrical component that stores energy in a magnetic field when current flows through it.
What happens when
a. ac current When an AC current passes through an inductor, the magnetic field around the inductor changes with the current. This changing magnetic field induces an EMF (electromotive force) in the inductor, which opposes the change in current. This is known as self-inducti
b. DC current When a DC current passes through an inductor, the magnetic field around the inductor builds up gradually. Once the magnetic field is fully established, there is no more change in current, so there is no self-induced EMF. Therefore, a DC current will flow through an inductor with no resistance.
Passes through it

ytdivine:
In a normal life, you cannot separate fire and smoke. Fire produces smoke. So also smoke produces fire.

Same way, you cannot separate electric current from magnetic field. Whenever there is flow of electric current on a conductor (Inductor), magnetic field is produced.
Also, whenever there is changing magnetic field, an electric current is produced.
Any confusion at this point?

ytdivine:
In a normal life, you cannot separate fire and smoke. Fire produces smoke. So also smoke produces fire.

Same way, you cannot separate electric current from magnetic field. Whenever there is flow of electric current on a conductor (Inductor), magnetic field is produced.
Also, whenever there is changing magnetic field, an electric current is produced.
Any confusion at this point?

ytdivine:
Happy Sunday to all
Am very happy with the response from our class rep(Southboy). The answer brought out the exact information that I needed.
It's good to have a good understanding of something. All my write up here are not copied from any note or book but directly from my head. Let's us have a deeper understanding of whatever we discuss here for future sake.

It's now very clear that the nature of magnetic field produced from AC and DC current are different. One is building and collapsing while the other is stable.

Another question that will earn you #200 recharge card from me is this:
What's the application of magnetic field produced from
a. AC current
I. Transformers
ii. Electric motor
iii. Radio wave
b. DC current.
I. MRI
ii. Batteries

Please everybody get involved. That's sure way of knowing it deep

ytdivine:
@Southboy, a very good attempt. Keep it up.
I want to make one point clear. We have two energy storing systems
a. Capacitive
b. Inductive
Capacitive systems store energy in electric field
Inductive systems store energy in magnetic field
Battery belongs to capacitive systems, hence have no business with magnetic field
In a circuit that integrate capacitor and inductor, we have the combination of the two field. - Electromagnetic field.

More input brings more clarification. Let everybody get involved. Kudos @Southboy

Southboy:


Are the following statements accurate?

1. Electric charge is produced when voltage pass through a capacitor.
2. Magnetic field is produced when current flows through an inductor.
If these statements hold true,
3. Is this the sole method for generating electric charge and magnetic fields?

Southboy:


Are the following statements accurate?

1. Electric charge is produced when voltage pass through a capacitor.
2. Magnetic field is produced when current flows through an inductor.
If these statements hold true,
3. Is this the sole method for generating electric charge and magnetic fields?

ytdivine:


You still need to get this clear. Am going to open a thread on Career in Electronics. I will explain capacitor in more detailed form. I said it earlier that capacitor is a mini battery.
Now let's explain voltage. Capacitor/ battery is a source of voltage. Voltage does not pass through a capacitor but is established across the two terminals.
Battery is a source of EMF - Electromotive force meaning force that set electrons in motion. Voltage is a potential difference between two point which is the same meaning as EMF.
Let's explain what it means by difference in potential.
Get a 12 by 1 inches plank( wood), at the two ends mark point A and point B. Put the ball at point A, the ball remains there. Remove the ball and put at point B, the ball remains there.
Question:
Why didn't the ball move from point A to B?
Answer:
It's because point A and point B are at the same level (Potential)
Now, slant the wood to an angle say like 60 degree. Point A at the top, point B at the bottom, point A is no more on the ground level as before (higher potential), point B still remains at the bottom level ( lower potential).
You can see that you have succeeded in creating a potential difference between point A and point B.
Put the ball at point A and observe what happen, you will see that the ball moves from point A to point B just because there is a potential difference.
In battery/ capacitor, point A and point B represent the positive and the negative terminals. Both are at different potentials. The ball represents the electron. The force the caused the electron to move (EMF) is the voltage.
Voltage is the source of force that drive election in motion within a circuit. The flow of election produces CURRENT though in opposite direction.
Hope I have not confused anybody

doghorp:
Good nairaland group
I have always want to learn more about Automation. I have HND Mechanical Engineering Bsc Physics and I want to do a masters Degree Instrumentation and Control Engineering. Good group to learn from

ytdivine:


You are in the right place

ytdivine:
Automation is built on Logic. You must be logical in your reasoning. Logic is equally built on knowledge, which means you must understand the system very well.
When a system stops working, it means that there is a missing signal. You must first determine the type and the source of the signal in the circuit. If you have a missing 5v or 24vdc signal, you must determine first where the voltage is coming from and the path of flow.

We are going to discuss or learn about CIRCUIT DIAGRAM. This is very important. When there is a fault or problem in a system, the first step you take is getting the circuit diagram. Without circuit diagram, you're not going anywhere. This diagram provides you the paths of signal flow, from there you can trace where the signal stopped.

Problems that has to do with current must be traced to current source, eg inductor. All these, we shall consider in details as we progress.
My motivation is active participation.
I wonder whether this class is meant only for southboy, others should get involved.

ytdivine:
Automation is built on Logic. You must be logical in your reasoning. Logic is equally built on knowledge, which means you must understand the system very well.
When a system stops working, it means that there is a missing signal. You must first determine the type and the source of the signal in the circuit. If you have a missing 5v or 24vdc signal, you must determine first where the voltage is coming from and the path of flow.

We are going to discuss or learn about CIRCUIT DIAGRAM. This is very important. When there is a fault or problem in a system, the first step you take is getting the circuit diagram. Without circuit diagram, you're not going anywhere. This diagram provides you the paths of signal flow, from there you can trace where the signal stopped.

Problems that has to do with current must be traced to current source, eg inductor. All these, we shall consider in details as we progress.
My motivation is active participation.
I wonder whether this class is meant only for southboy, others should get involved.

Southboy:
The rate at which the class is progressing is not encouraging oooooo. I keep refreshing this his page checking for update. Atleast let's put some structure in place e.g. Lecture time, so that everyone knows when to be in class and respond to any question asked.

ytdivine:


I was too busy today. I can't fix time since I put up some write up when less busy.

ytdivine:
Another question
a. How does the soft iron behave when DC current is applied?
b. When the DC current is remove?

Where are others outside Southboy, I want other people to make some input

doghorp:


a. When DC Current is applied to a soft iron the magnetic flux is increased and the flux lines will be highly concentrated because soft iron have have high permeability it can strengthen the field and increase the working of a machine, it also have low reluctance which means it allows magnetic lines through them easily.

b. When the DC Current is removed it does not retain it magnetism in other word it does not permanently magnetized

ytdivine:
Another question
a. How does the soft iron behave when DC current is applied?when a DC current is applied to soft iron, it becomes temporarily magnetized and generates a magnetic field.
b. When the DC current is remove?Once the DC current is removed, the magnetization of the soft iron diminishes rapidly, and the material loses its magnetic properties.

Where are others outside Southboy, I want other people to make some input

doghorp:


a. When DC Current is applied to a soft iron the magnetic flux is increased and the flux lines will be highly concentrated because soft iron have have high permeability it can strengthen the field and increase the working of a machine, it also have low reluctance which means it allows magnetic lines through them easily.

b. When the DC Current is removed it does not retain it magnetism in other word it does not permanently magnetized