Understand Ohm's Law: Proportional Relationship Explained

  • Thread starter Thread starter Mrod777
  • Start date Start date
  • Tags Tags
    Law Ohm's law
AI Thread Summary
Ohm's Law defines the relationship between voltage, current, and resistance in an electrical circuit, stating that current (I) is directly proportional to voltage (V) and inversely proportional to resistance (R). The equation I = V/R illustrates this relationship, where an increase in voltage results in an increase in current, while an increase in resistance leads to a decrease in current. The discussion highlights the concept of proportionality, clarifying that direct proportion means both variables increase together, while indirect proportion indicates that one variable's increase results in the other's decrease. This understanding of proportional relationships is essential for grasping basic electronics principles. The explanation provided effectively addresses the inquiry about the proportional nature of Ohm's Law.
Mrod777
Messages
5
Reaction score
0
Ohm's law states that, in an electrical circuit, the current passing through a conductor between two points is directly proportional to the potential difference (i.e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them. The mathematical equation that describes this relationship is:

I = V/R
I realize this may be a basic question in electronics however I am looking at it in a new perspective, that of proportions.

Can someone please aide me in comprehending what is defined as (proportional) in this Law.
thanks
 
Physics news on Phys.org
The law was formulated as V across two points is directly proportional to the current I. The constant of proportionality was called the resistance R.
 
"Direct proportion" means that as one variable increases, the other increases (more voltage = more current).

"Indirect proportion" means that as one variable increases, the other decreases (more resistance = less current).
 
Thanks Noein your anwser explains what I wanted to know
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Thread 'Trying to understand the logic behind adding vectors with an angle between them'
My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
Back
Top