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Because you have to start somewhere - you can't derive ALL units. You have to have SOME fundamental units.
For example, 1 ampere = 1 coulomb / second. That also means that 1 coulomb = 1 ampere x 1 second, or that 1 second = 1 coulomb / 1 ampere. In other words, you can derive any of the three units from the other two. In practice, for base units, units were chosen that can be measured with great precision.
Another AnswerThe ampere is not a 'fundamental' unit; it is a base unit. The ampere was chosen as a base unit, because it relates electrical units to mechanical units, being defined, as it is, in terms of the force (which itself is defined in terms of base units) between current-carrying conductors.
You might be getting confused because, quite wrongly, the ampere is often defined as a 'coulomb per second'. While it is certainly equivalent to a coulomb per second, it is not definedin this way.
What else can I help you with?
What fundamental quantities constitute 1 ampere of electric current?
The ampere is an SI base unit and is not defined in terms of charge and time at the moment. There is a proposal that has been put forward (2005), though still not ratified (2014) that would indeed define an ampere in terms of charge and time. Since the second is a fundamental unit and an electron a fundamental particle it is proposed to define an ampere as the rate of flow of fundamental charges. It is equivalent to 1 coulomb of charge flowing for 1 second. At the moment , the amp(ere) in fact, is defined in terms of the force between parallel, current-carrying, conductors. However, there is uncertainty in this measurement of a few parts in 10,000,000. So, if you were to break down the ampere, you would find it currently is defined in terms of the metre (a base unit) and the newton (a derived unit) which, in turn, is defined in terms of the base units kilogram, metre, and second.
Who said the fundamental theme though all the centuries has been the principle that force?
The quote "The fundamental theme throughout all the centuries has been the principle that force and coercion shall not be acknowledged as the foundation of men's civil relations" was said by Charles H. Huberich.
What shape can be drawn though a solenoid to determine the magnitude of its magnetic field?
A circular loop or coil can be drawn through a solenoid to determine the magnitude of its magnetic field. By measuring the induced current in the loop or coil, the strength of the magnetic field can be inferred using Ampere's law.
Why is it impossible to destroy energy?
Energy cannot be destroyed according to the law of conservation of energy. Energy can only change forms or be transferred from one system to another, but it cannot be destroyed entirely. This principle is a fundamental concept in physics.
What is the true density of?
the ? is commonly used to ask a question though it was derived from ancient languages that origionally had a left side the the now very unballenced shape of the ?, today we simply use the right hand portion as can be seen below?
Why current a fundamental quantity though it is flow of charge per unit time?
Ampere = Coloumb / second is the same as saying that Coloumb = Ampere x second. Any of the two electrical units can be derived from the other one. Ampere is NOT a "fundamental quantity"; it is an SI base unit. The base units are not necessarily those that are somehow considered more "fundamental" than others; instead, the base units are those that can be measured with a great accuracy. In the case of current vs. charge, it seems that measuring a current can be done with greater accuracy than measuring a charge directly; therefore, the current is the base unit, and the current is derived. However, this doesn't make current any more "fundamental" than charge.
Why we use force in defining ampere though ampere is a fundamental quantity?
Mass is a fundamental unit. Force is fundamental. Do you see a problem with this: Force = mass * accelation, or Mass = Force / acceleration Fundamental quantities are related to each other. There is no contradition to write an equation relating them to one another. An ampere can be defined as 1A = 1C/second.
What fundamental quantities constitute 1 ampere of electric current?
The ampere is an SI base unit and is not defined in terms of charge and time at the moment. There is a proposal that has been put forward (2005), though still not ratified (2014) that would indeed define an ampere in terms of charge and time. Since the second is a fundamental unit and an electron a fundamental particle it is proposed to define an ampere as the rate of flow of fundamental charges. It is equivalent to 1 coulomb of charge flowing for 1 second. At the moment , the amp(ere) in fact, is defined in terms of the force between parallel, current-carrying, conductors. However, there is uncertainty in this measurement of a few parts in 10,000,000. So, if you were to break down the ampere, you would find it currently is defined in terms of the metre (a base unit) and the newton (a derived unit) which, in turn, is defined in terms of the base units kilogram, metre, and second.
What is the difference between an ampere and a coulomb?
A ampere is a measure of the flow rate of electricity a coulomb is an amount of electricity. So 1 ampere is a flow of electricity at the rate of 1 coulomb per second.AnswerStrictly speaking, as the ampere is an SI base unit whereas a coulomb is a derived unit, it is more accurate to say that 'a coulomb is an ampere second (A.s)'.With reference to the first answer, the ampere is the SI unit for electric current (not the 'flow rate of electricity', which is meaningless), and the coulomb is the SI unit for electric charge (not the 'amount of electricity'). 'Electricity' isn't a quantity, so it cannot be measured.
Can gram milliliter be a derived unit?
Yes, though it is not easy to think of a situation where it would be useful.
Is Ampere an SI base unit for measuring mass?
Yes, the ampere is an SI base unit, one of the seven, and equals the passage of a Coulomb of charge per second. Its official definition has to do with force between current carrying wires though.
Why do you represent current as 'i' even though its unit is ampere?
I is just a sign assigned to represent current in equations and ampere stands for its unit of measurement. So I equals V divided by R where I stands for current, V stands for voltage, and R stands for resistance. And thats just as representation all 3 representations have their own measurement units: For I its Ampere, for V its Volts and for R its ohm's.
How may watts in one ampere?
Watts is a unit of power, whereas Amperes is a unit of current. They're related though, along with Voltage, Resistance etc. But they're not the same thing, so to answer your question: There are no watts in an ampere! Power (W) = Voltage (V) x Current (I)
What antiarrhythmic medications is derived from the foxglove plant Propranolol Bretylium Digoxin or Procainamide?
Digitalis is derived from the foxglove, though not a Pharmacist I would suggest that Digoxin is the answer.
Are Navy core values though fundamental to Naval operations are overlooked in a TCRM situation?
True
Navy core values though fundamental to Naval operations are overlooked in a TCRM situation.?
True
What is a sentence for Comingly?
Comingly is not an English word nor it means anything, it might be derived from the verb come though.
