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You should upgrade or use an alternative browser. Thread starter lilimike Start date Jul 16, Status Not open for further replies.

I came close to register as anonymous for this one but I figured why not! I've been asking myself this question for a while. Since we don't necessarily know what the load is but we know what the supply source is. Ross Craney New Member. Sceadwian Banned. Because they supply voltage, but devices consume current. We know what the voltage is, but at a given current draw the voltage can vary dramatically. The load and the supply source are both REQUIRED to be known to characterize a condition, and the voltage allowance for a DC source is not a finite number and the AC variance is just as much unknown unless defined, in which case there are no questions.

Last edited: Jul 16, I understand that I am not going to change the rule or anything for that matter and i also understand that both voltage and current are required. I was just wondering why it was called AC and DC since we are talking about voltage. The current comes after when and if there is a load In other words if I see a wire and i or anyone is curious we would ask two questions or measure: 1 - How much voltage is there in this wire?

At this point it doesn't have to have a load. QuietMan Member. A lot of electronic terminology is a lot older than electronics. This is a pretty good example of it. In describing a supply, you can say it is 12Vdc or 12Vac. The DC or AC can be added for clarity. The V gives you the electromotive force; the DC or AC tells you if the current flow is steady state direct current or changes direction alternating current. It is what it is. Quoting QuietMan: "A lot of electronic terminology is a lot older than electronics.

Early discussions of possible electron flow thought there were particles at a higher potential thus, positive which would naturally flow to a lower potential thus, negative. And an assumption was made as to which electrodes in a battery were positive and negative. Ohm had already published his theory of electron flow and the two factors voltage and resistance controlling the amount of current flow.

Scientists had already observed the blocking characterisics of a selenium crystal the early diode. Thus the arrow in the diode symbol was originally meant to indicate which way this positive flow would go when the switch was thrown. All electronic theories and equations were based on this positive-going flow. The sparks really flew that day! I couldn't resist And now teachers are stuck telling students that electron flow goes AGAINST the diode's arrow, but holes the positive ions do go "the right way".

And students have to think "reverse flow" when they use equations meant for "positive particles". And now you know I am SO showing my age here! MRCecil Member. Click to expand Ratchit Well-Known Member. To the ineffable all, There is a lot of confusing and inexact descriptive terminology in the science and engineering fields. Some of it is perpetuated by people and organizations who should know better. Other times it is done because it was always done the wrong way, and no one has the courage to point out the right way.

Since the first Star Wars movie was released, they started calling it "spacewalking". No journals or reporters ever asked NASA if the astronauts would walk away if their tether broke. It should be called alternating or sinusoidal excitation , and steady value or constant value excitation. I will leave it to you to select the abbreviations. Another example is "power supply". It is actually a electrical energy supply. Its power, voltage, and current is a characteristic of the energy supply, yet folks insist on calling it by its characteristics instead of what it really is.

Current is charge flow. To say "current flow" means "charge flow flow", which is redundant and ridiculous. I hear a lot about Ben Franklin and others getting it wrong in naming the polarity of the electron negative. Actually it does not matter. There are just as many positive charge carriers in the universe as negative charge carriers like electrons. Washington, DC. ID Required at check-in. Extended Stay. Apartments New York, NY. Settle in and spread out. Curated spaces in hand-picked neighborhoods that you can book like a hotel.

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