Electrical Engineering Explained In 5 Seconds!

Kaustubh Katdare · 2012-11-02T18:17:19+00:00

I think Electrical Engineering isn't very complicated. All you need to know and understand is just one equation : V=IR. Though this is a simple equation, not many really can visualise it. Here's a picture that will explain this very basic concept in just 5 seconds. Electrical engineering will become a LOT easier if you understand this - PS: Not exactly a technical topic; but I thought this would be the most appropriate section because it's all about 'basics', you see.

Electrical Engineering Explained In 5 Seconds!

Kaustubh Katdare
@thebigk

Updated: Nov 2, 2012

Views: 1.1K

I think Electrical Engineering isn't very complicated. All you need to know and understand is just one equation : V=IR. Though this is a simple equation, not many really can visualise it. Here's a picture that will explain this very basic concept in just 5 seconds. Electrical engineering will become a LOT easier if you understand this -

PS: Not exactly a technical topic; but I thought this would be the most appropriate section because it's all about 'basics', you see.

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naveee

Member • Nov 2, 2012

But transformer doesn't applies this major law sir 😀 ????

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Kaustubh Katdare

Administrator • Nov 2, 2012

naveee
But transformer doesn't applies this major law sir 😀 ????
Ultimately, Electrical engineering is all about Current, Voltage and Resistance; right?

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Ramani Aswath

Member • Nov 2, 2012

naveee
But transformer doesn't applies this major law sir 😀 ????
Why not?
You have to replace resistance by impedance, which is AC resistance in a sense.

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Jeffrey Arulraj

Member • Nov 2, 2012

naveee
But transformer doesn't applies this major law sir 😀 ????
Except non linear devices all the other devices comes into this list only

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Ramani Aswath

Member • Nov 3, 2012

jeffrey samuel
Except non linear devices all the other devices comes into this list only
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Jeffrey Arulraj

Member • Nov 3, 2012

bioramani
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😨 I am confused It is an entire lab manual of Harvard university and that tells all about many experiments in electrical but I am not getting your point here sir

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Ramani Aswath

Member • Nov 3, 2012

Non linear issues are discussed. It was in extension to your post.

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Jeffrey Arulraj

Member • Nov 3, 2012

bioramani
Non linear issues are discussed. It was in extension to your post.
Got it sir thanks for clearing

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naveee

Member • Nov 3, 2012

The_Big_K
Ultimately, Electrical engineering is all about Current, Voltage and Resistance; right?
ya..... mutual inductance is playin a gr8 role in transformers..... ya i agree ur point 😀

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naveee

Member • Nov 3, 2012

bioramani
Why not?
You have to replace resistance by impedance, which is AC resistance in a sense.
sir transformer doesnt obeys ohm law......... am sure about it ..... .....becoz in transformer ratio....voltage and current ratio are inversely proportional sir 😀

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Jeffrey Arulraj

Member • Nov 3, 2012

naveee
ya..... mutual inductance is playin a gr8 role in transformers..... ya i agree ur point 😀
Hey pal better not use SMS language here in forums

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Jeffrey Arulraj

Member • Nov 3, 2012

naveee
sir transformer doesnt obeys ohm law......... am sure about it ..... .....becoz in transformer ratio....voltage and current ratio are inversely proportional sir 😀
And it does not obey where

All the transitions take place in constant power scenario only and so it does obey Ohm's law

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Ramani Aswath

Member • Nov 3, 2012

naveee
sir transformer doesnt obeys ohm law......... am sure about it ..... .....becoz in transformer ratio....voltage and current ratio are inversely proportional sir 😀
Consider the two windings separately.

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Jeffrey Arulraj

Member • Nov 3, 2012

bioramani
Consider the two windings separately.
Even if we take Mutual inducatnce principle also there is Ohmic rule in it

And to simplify the issue we can assume independent windings

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Anoop Kumar

Member • Nov 3, 2012

😁... This picture should be in text book.

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lal

Member • Nov 3, 2012

Well, transformer is a machine. It works on mutual induction. The process it does is to step up or step down voltages. The turns ration and mutual induction are all dependent on what a transformer does, its work, its use. Just like a motor as a machine is used to convert electrical energy to mechanical energy.

But, for a current to flow through any of the windings in the transformer, you must apply a potential difference. The current will be directly proportional to the potential difference applied across the winding. Bingo!! there is Ohms law. Being AC, there is impedance instead of just resistance.

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prashanth463

Member • Nov 3, 2012

jeffrey samuel
Except non linear devices all the other devices comes into this list only
why not non linear devices?, all kind of devices accept this law right? or am i mistaken at some point?

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naveee

Member • Nov 3, 2012

jeffrey samuel
Hey pal better not use SMS language here in forums
ok pal got it......i will change it 😀

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naveee

Member • Nov 3, 2012

bioramani
Consider the two windings separately.
we leave that...... but according to ohms law...current and voltage should be directly proportional.. if we see in transformer ratio........ it is in inverse......why and how ???? thats the great doubt,,,!!!!! my lecturers told that is due to mutual inductance.. !!!!!!!!......could you please clarify me sir..... 😀

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Ramani Aswath

Member • Nov 3, 2012

Think of it this way. First of all there can be no induction unless a current flows. A flowing current set up a magnetic field. An AC sets up a cyclic field. The induced voltage in the second coil will depend on the inductance (which is proportional to the number of turns) of the second coil.
If you have n turns in the primary, you get 1/n times the primary voltage in the secondary for every turn. If you have n turns in the secondary also the voltage in the secondary is the same as the primary and you have what is called an isolation transformer. The secondary voltage is floating and not referred to ground.
Here is a video tutorial:

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Jeffrey Arulraj

Member • Nov 4, 2012

prashanth463
why not non linear devices?, all kind of devices accept this law right? or am i mistaken at some point?
All Ohmic rules holds good for Linear devices only

Diodes does not obey these laws cos current I is not proportional to Voltage applied V

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Jeffrey Arulraj

Member • Nov 4, 2012

naveee
we leave that...... but according to ohms law...current and voltage should be directly proportional.. if we see in transformer ratio........ it is in inverse......why and how ???? thats the great doubt,,,!!!!! my lecturers told that is due to mutual inductance.. !!!!!!!!......could you please clarify me sir..... 😀
Hey friend you are failing to understand this each side the conversion takes place in terms of constant power

For an ideal transformer

VpIp=VsIs

This is a direct effect of Ohms law

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prashanth463

Member • Nov 4, 2012

jeffrey samuel
All Ohmic rules holds good for Linear devices only

Diodes does not obey these laws cos current I is not proportional to Voltage applied V
thanks samuel for clearing it out with a simple example

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Jeffrey Arulraj

Member • Nov 4, 2012

prashanth463
thanks samuel for clearing it out with a simple example
My pleasure friend

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naveee

Member • Nov 4, 2012

jeffrey samuel
Hey friend you are failing to understand this each side the conversion takes place in terms of constant power

For an ideal transformer

VpIp=VsIs

This is a direct effect of Ohms law
okay okay ....... 😀

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lal

Member • Nov 5, 2012

jeffrey samuel
Hey friend you are failing to understand this each side the conversion takes place in terms of constant power

For an ideal transformer

VpIp=VsIs

This is a direct effect of Ohms law
Power in primary equalling the power developed in secondary. Well, I dont think there is Ohm's law in effect there. Power is transferred by induction. Or say varying magnetic fluxes created by the primary winding linking with the secondary transfers power to secondary. Since almost the complete flux generated by varying primary current links with the secondary winding, the power transferred is very high too, almost cent percent efficiency.

Transformer is an energy conversion device. The reason that primary power equals the secondary power is because of energy conservation. In a step up transformer, if the current was to increase with the voltage, then the energy in secondary will be higher than that in the primary. The law of energy conservation has the role here. To conserve energy, secondary current decreases so that, VpIp = VsIs. The converse is true for step down transformers.

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Ramani Aswath

Member • Nov 5, 2012

Here is a simple article on Ohm's law for AC:
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