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When to use P=I^2R, P=VI, P=V^2/R? - Physics Forums 1 May 2014 · Hi, I know that P = I^2R is to find heat loss. but can we use P = V^2/R or P = IV to find the heat loss? simply when do we use which?? (or can we use all anytime?)
Why are voltage and current inversely proportional to power, but ... In the first equation, voltage and current are inversely proportional. In the second equation, voltage and current are directly proportional. If I raise the voltage, am I decreasing the current according to V = P I V = P I or am I increasing the current according to V = I × R V = I × R?
Why does a resistor reduce voltage if V=IR? [duplicate] According to Ohm's law, resistance varies directly with voltage You should read this the other way. Voltage varies directly with current. "R" is the constant of proportionality telling how much it varies. If I add in a resistor to a circuit, the voltage decreases. If you have a resistor in a circuit, with a current flowing through it, there will be a voltage dropped across the resistor (as ...
voltage - Does a current source override the v=ir rule? - Electrical ... 24 Oct 2017 · Consider: Here I have two almost identical circuits. The only difference is that the first one has a current source with the voltage source. Shouldn't the current in the upper circuit be v/r, or 1...
Can I use V=IR in the analysis of AC circuits? 9 Jan 2016 · V = IR V = I R is always valid in any circuit at any frequency but there are some things to watch out for and be aware of when the frequencies get really high or when there are non-linearities such as diodes to consider. In an AC circuit V= IR like this: - In other words I and V follow each other and have a constant ratio to each other.
ohms law - Can V=IR be applied to a short circuit? - Electrical ... 18 Dec 2019 · Yes, V=IR can be applied to a short circuit. The most extreme form of a short circuit is a superconductor. The voltage across a superconductor is zero, regardless of the current flowing through it. What you can't do is use I=V/R when R is zero, for obvious numerical reasons. In practice, what most people call a 'short circuit' is just a very low resistance, for instance a …
Electric Potential: V = IR Explained - Physics Forums 23 Mar 2007 · Electric potential goes like the inverse of distance squared and the product of the two charges. But I can't see how this can produce V = IR.
Derivation of microscopic Ohm's law from macroscopic version? 26 Sep 2021 · V = IR (Ohm's law for materials where V ∝ I) V = I R (Ohm's law for materials where V ∝ I)
I understanding the formula Power loss= I^2 R - Physics Forums 8 May 2011 · The power loss is given by I ^2 R where I is the current and R is the resitance. I know why these variables are in this equation. V = I R P = I V therefore, P = I² R What I don't understand is the practical explanations for this. Why are …
Darn you V=IR, you are wrong (does V really equal IR?) 14 Jul 2014 · V=IR is only valid at steady state. You are trying to apply it outside of that condition, so it doesn't always work. Transient Responses are not modeled at all in a 1st order system.