What is the fundamental units for coulomb? [closed]
2015年4月23日 · The coulomb (C) is the derived unit for charge in SI. One coulomb is the amount of charge in one ampere-second. The elementary charge (charge of one proton or (-) electron) is roughly ${\sim}1.602\times10^{-19}\:\mathrm C.$ Moreover, $1\:\mathrm C =1\:\mathrm{A\,s}$. The units work out the in the equivalency, which never requires breaking the ...
Physical dimensions for the Coulomb force in SI and CGS
One Ampere is one Coulomb per second, so the unit of electric charge, the Coulomb, is equal to one Ampere-second. When there's an equation that has Amperes or Coulombs on one side, and something without those units (like force) on the other side, the equation will always have a constant that has the correct units to balance things out.
Why is ampere still a base unit? - Physics Stack Exchange
2020年1月13日 · The ampere is still a base unit, according to the SI brochure. However, in my perception the recent redefinition of units effectively defines the Coulomb as e/(1.602 176 634 × 10^−19), and the ampere is derived as 1 A = 1 C/s.
Why is the ampere a base unit and not the coulomb?
2013年7月14日 · I always thought of current as the time derivative of charge, $\frac{dq}{dt}$. However, I found out recently that it is the ampere that is the base unit and not the coulomb. Why is this? It seems to me that charge can exist without current, but current cannot exist without charge. So the logical choice for a base unit would be the coulomb. Right?
electrostatics - Why does Coulomb's constant have units? - Physics ...
In Gaussian units the unit of charge is defined such that Coulomb's Law has a dimensionless, unit constant of proportionality. $$ F = \frac{q_1 \, q_2}{r^2} \,.$$ This is a perfectly valid way to do physics. In essence we have folded $\sqrt{k}$ into the numerical value of each of the charges:
Why is a Coulomb not a fundamental unit? [duplicate]
2017年7月29日 · A fundamental unit is defined as. one of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. As per wikipedia: The SI unit of charge, the coulomb, "is the quantity of electricity carried in 1 second by a current of 1 ampere".
How much is a Coulomb, really? - Physics Stack Exchange
2016年2月26日 · According to Google, typical AA batteries have 400-900 mAh of capacity. mAh is a strange unit of charge, but it's very useful for converting between current, capacity and time. Essentially, 400 mAh is the amount of charge passed by a current of 400 mA over 1 hour (or 200 mA over 2 hours, 800 mA over 0.5 hours, etc, hence its utility).
Has anyone charged an object with 1 coulomb? Why was such a ...
2021年12月29日 · The natural consequence of this is: A flowing charge of $1$ coulomb (i.e. a current of $1$ ampere flowing for $1$ second) is also a convenient unit, neither ridiculously large nor ridiculously small. The fact, that a static charge of $1$ coulomb is a really big thing, is an entirely different story, which has to do with the large electric force ...
Coulomb's law in vector forms? - Physics Stack Exchange
2016年10月25日 · $\hat r$ is a unit vector which is pointing from the other charge to the charge itself. The vector version of Coulomb's law is: $$\vec F_1=k\frac{q_1q_2}{r^2}\hat r_{21}$$ Note the difference in notation from your expression: $\vec F_1$ is the force felt by charge 1. $\hat r_{21}$ is the unit vector from charge 2 towards 1.
Are the Amp and coulomb equivalent? - Physics Stack Exchange
2017年8月19日 · 1 coulomb is 1 ampere per second and 1 ampere is 1 coulomb per second therefore they are always equivalent. They would only be different if you changed the time but the units themselves are based only on the current/charge in 1 second.