Why is current flow opposite to electron flow?Watch
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Actual electron flow is from the -ve terminal to the +ve terminal. Conventional current is defined the other way around.
BEFORE the discovery of the electron and hence electric current, scientific thinking in the 17th/18th centuries had described electricity as a flow of charge.
Then, when Benjamin Franklin made an assumption that charge flowed from smooth wax to rough wool in the mid 1700's, his convention became established to the extent that it was too difficult to change by the time actual electron flow was discovered well over a century later. (Batteries, electric motors, electric lights, telegraph etc. were all in widespread use in the latter part of the 19th century.)
Hence the difference between electron-flow and the so-called historical conventional-current flow.
In reality, for almost all electrical calculations, it makes no difference which way, as long as all of the calculations are performed using the same reference direction. But, because of that original erroneous assumption, we still use conventional current flow today.
However, it is essential to know the reality of electron flow when understanding and dealing with physics at the atomic scale.
In a beam of protons or alpha particles, the flow of charge is positive.
A negative current is the way negatives move
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