00:02Hi friends, the knowledge you gain while studying isn't just what you memize, but what you can utilize.
00:10Industrial equipment and electronic devices have very complex electrical circuits.
00:17In this series, we're asked to calculate the electric current flowing through a single wire.
00:28Around 1845, Kirchhoff studied various electrical circuits.
00:34He came to a rather interesting conclusion, the algebraic sum of the currents in a network of conductors meeting at
00:40a point is zero.
00:44This statement is also known as Kirchhoff's current law.
00:55Mathematically, sigma i equals zero.
01:00In our electrical circuit, there are two electric currents flowing toward the branching point, and one electric current flowing out
01:07of the branching point.
01:14We don't know whether the electric current is flowing in or out of this wire.
01:20This is where the sign of the current is important.
01:24When the sign of the current is positive, it means the electric current is flowing toward the branching point.
01:32If we don't know, just assume the current is flowing toward the branching point as a reference.
01:40Plus 0.5, plus 0.3, minus 1.2, plus i equals zero.
01:49I think this calculation is quite easy, i is about plus 0.4 ampere.
01:57The sign of the current is positive, meaning that it is true that electric current flows into the branch point.
02:06Happy learning everyone!
02:07Happy learning everyone!
02:09Great learning
02:09, it was necessary.
02:09When I think it's free,
02:10I would not help neste season before.
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