How did physicists come up with a standard for measuring charge? How an electrical measurement of charge was made?
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You can of course find this on wiki...or many other places.
Today, charge is related to the elementary charge e
The SI unit of charge, the coulomb, "is the quantity of electricity carried in 1 second by a current of 1 ampere A". Conversely, a current of one ampere is one coulomb C of charge going past a given point per second:
$1 A = 1 \frac{C}{s}$
The Ampere is defined by the elementary charge, see e.g. wiki for more detail than you probably want.
Practical measurement - if you have a capacitor of known strength, you can measure the charge on it with a voltmeter.
Hope that helps.
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$\begingroup$ I am unable to understand this. When charges were discovered and a mathematical equation involving charges is not known , what reference standard was chosen to represent 1 C of charge? $\endgroup$ – Aravind Oct 13 at 12:37
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$\begingroup$ In June 1785 Coulomb measured the electric force. aps.org/publications/apsnews/201606/physicshistory.cfm If what you are asking is how did he come up with the constant, that has been asked before physics.stackexchange.com/questions/243259/… $\endgroup$ – Mr Anderson Oct 13 at 23:31
