Watching every single one of your videos and let me just say the amount of details you give us in such a short amount of time is super helpful and covers so much. Thank you!
Thankyou for this video, i'm currently doing an auto electrical trade apprenticeship and the material and way in which it was presented in class was for some reason no where near this clear.
Ohm's Law is our everything😀 Not only in instrumentation but everywhere where electricity is of use. It's also of high importance and usage in automotive electrical and electronics systems repair.
How do we apply ohms law? How is ohms law useful in designing a circuit? I designed a simple circuit between a terminal holding 2 AA batteries and a led light. The battery got so hot it started to melt! Why did this happen? How can it be avoided? What is the process for wiring circuits?
In a circuit with only a resistor connected to a battery the resistor drops all the voltage. The voltage before the resistor is the same as the battery voltage and after the resistor 0V. The current in the circuit is the same everywhere. If you put a light bulb in series with the resistor it doesn't matter if it is before or after the resistor. The voltage across the light bulb the same everywhere.
We know that current is only present when a voltage is applied, but how can voltage exist without current? E=I/R and if I=0 or R equals infinity, then E must equal zero, yet voltage is a potential and can exist with no work being done. So how can one side of the equation =0 and the other side =X?
In an insulator the resistance is practically infinite so no current flows. Also current can exist without voltage in a superconductor because the resistance is zero
@@brianlittle717 I don't think we can apply ohms law very well in those scenarios. 0×∞ is not defined. Also the voltage in ohms law means voltage drop over resistance. You could argue that there can't be voltage drop without current. If you put a resistor in series with the open circuit the voltage drop over that resistor would be zero
I think I see what you’re saying. Voltage is defined as difference in potential. If there is no “difference” there is no voltage. However an unplugged electrical receptacle has voltage, but there’s no load, no current, and no power. No work. I=0 but the other side of the equation equals 120 volts. Maybe ohms law doesn’t apply when there’s no load, or like you’re saying, no resistance drop. Ohms law applies to circuits. If there’s no load, it’s not a complete circuit. Maybe this explains how one side of the equation can be zero and still have voltage.
Great but Ohms's law is actually E=IR where E=Electromotive force measured in Volts. It seems that electrical formulae have been mixed up between what is measured vs. the units of measurement used. (But V=IR is easier for the lay person).
i literally sit in a lesson from 9am til 4.30pm majority of it being about ohms law and come out of the lesson confused because of the guys shit analogy's. i watch a 5 min plus youtube video and understand better than i did in a 7 and half hour lesson.
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