Physical Science 6.4a – Ohm`s Law

By | September 10, 2015

Physical Science. An explanation of Ohm’s Law. From the Physical Science course by Derek Owens. Distance learning courses are available at

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18 thoughts on “Physical Science 6.4a – Ohm`s Law

  1. derekowens

    Right, that works algebraically. But in the real world, voltage isn’t zero every time. V and V mean different things in different contexts.

  2. derekowens

    Well, yes. Ohm’s Law says that the current in directly proportional to the voltage and inversely proportional to the resistance. The equation I = V / R says exactly the same thing. So the equation is essentially the law also. You can state the law in English or you can state it mathematically, but it’s the same concept either way.

  3. badgyalbirdieakaray

    wait isnt that jus the equation? i was taught never to confuse the law with the equation, i was taught that the law was that current is directly proportional to the potential difference provided that all other physical conditions remain constant…the equation your writing is simply just an equation to do the math…

  4. kennis942

    fucking good, i just started el. School, thanks for this you explained it better than my teacher :D

  5. derekowens

    Yes, U is commonly used for Voltage, to avoid confusing it with the V for Volt, the unit in which voltage is measured.

    E is also commonly used. E is sometimes referred to as “electromotive force”. Even though voltage isn’t a force, it is often helpful to think of it as the “force” that pushes the electrons through the wires.

    So V, U, and E are all used to represent voltage. The various units and symbols can be confusing.

  6. esQo0020

    i think that for example U=1.5V so voltage is “U” atleast in all of the books ive seen

  7. sshapewa

    ur very right man.he is slow,very articulated in speech and explaination

  8. 1974cpdmm

    This is the best explanation I have seen on youtube for people that have no clue about electricity.

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