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Why current a fundamental quantity though it is flow of charge per unit time?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 13y ago
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Difference between voltage and current?
Voltage is electrical potential, measure in derived units of volts, which is joules per coulomb. Current is electrical flow, measured in derived units of amperes, which is coulombs per second. Stated in other terms, voltage is energy per charge, while current is charge per time. That makes power, or watts, equal to energy per time, and that is joules per second.If you think of the water system analogy, volts is sort of similar to pounds per square inch (though not completely so), while amperes is similar to gallons per minute.AnswerVoltage is synonymous with 'potential difference' -not potential- measured in volts. Current is the flow of electrical charge, measured in amperes. The volt is an SI derived unit, wheras an ampere is an SI base unit.
What is a current source?
A current source is a source that we can draw current from and can regulate to control the amount of current we draw. It is kind of a "mirror" of the voltage source. Here's how it might work. We usually are interested in keeping the current constant when we use a current source (though not always). To do this takes a varying voltage source to keep that current constant when using the source with a dynamic load (a load that is changing). There will have to be a way for the source to sense current flow and compare it to the setting put in. That way the source can maintain that constant current by adjusting to the correct voltage needed to maintain it. Many battery charging applications require this technology. We want "maximum" current so we can quickly charge the battery, but we cannot "overload" the battery, so we have to be careful not to do that. A constant current source is the answer. It will supply a steady "maximum" current, and the source will (as the battery charges and the "resistance to more charge" increases) increase in voltage to keep that amount of current flowing into the battery to charge it in the shortest time. A VERY GOOD EXPLANATION and I could add that a perfect current source would have 0 (zero) input/output impedance or you could say it's would be more like "a short that provides power".
Does Len Goodman Smoke?
I checked out an other site. According to that site he is a smoker. Do not know how current that is though.
What are the properties of inductive load?
inductive load does not allow the current to become zero eve though the supply source get removed . inductive load reduce the power factor . they does not allow sudden change in current in the load ...
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no
What is the total enargy of a point charge?
though its a definite quantity still it can't be found out as our current theories fail as we approach a point charge by more nearer than 1/10000 meters.
Why is electric current a scalar quantity?
For a physical quantity to be termed a vector quantity, having magnitude and direction is not enough. The quantity should obey the laws of vector addition too. Like the triangle law or the parallelogram law. As we know, if two currents meet at a junction, the total current of the resultant current will be the algebraic sum of the two current and not the vector sum.Sometimes, treating a current like a vector makes sense, like when the current though a conductor induces a magnetic field.
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.
Is emf a scalar or vector quantity?
Emf has direction within a current loop, though it is not scalar. It's a bit between though as direction should be otherwise accounted for when discussing induced Emf. Not quite either.
What is the flow of electricity charge?
it is the rate at which electric charges pass though a conductor. The charged particle can be either positive or negative. In order for a charge to flow, it needs a push (a force) and it is supplied by voltage, or potential difference. The charge flows from high potential energy to low potential energy.
Is electric potential difference a vector?
We generally think of electric current as a scalar quantity. When we think of 1/4th amp or 20 amps, we think of an amount (a scalar quantity) of current flow. On another plane, the electromagnetic forces at work in current generation are actually force vectors. In the traditional sense, electric current, which is the movement of electrons, is from negative to positive. This is not a vector, though. In the macro or "large" world, think of current as scalar.---------------------------------------------------------------------The beauty is that though current is not a vector definitely its direction of flow is used to make length as vector. I is not vector. dl is not vector but I dl will be considered as vector. So innovative and essential concept.Current density is a vector which appears in Maxwell's equations.
Is weight a fundamental quantity Give reasons?
No, weight is not a fundamental quantity. Though mass is. The reason for adopting this viewpoint is this: the mass of a body is intrinsic to the body itself - e.g. an electron has the same mass anywhere in the universe. The weight of a body is just the gravitational force acting on that body, and obviously depends on the gravitational field it finds itself in. For example, your mass remains the same if you fly to the moon, but your weight on the moon's surface is roughly one-sixth of your weight here on Earth.
What is the symbol for amps?
Hi,The symbol for amps, or amperes, is A. though in the equation V=IR, current is represented by an I. the proper symbol is A.CommentDo not confuse the symbols for quantities and for units of measurement. Current is a quantity, and its symbol is an italic I. The ampere is a unit, and its symbol is an upright A.
Can a scalar quantity be made into a vector quantity by adding a direction to its magnitude why or why not?
Yes this happens in case of area. Usually area is a scalar quantity. But we provide the direction of course perpendicular to its plane area we make it as a vector. Same way though electric current is not a vector it is sensed as vector as we put along with length of conductor. I is scalar but Idl is vector.
Current price of kodak easyshare digital cameras?
Retail prices of current Kodak Easyshare 12 Mega Pixels start at $100 (though older models can be bought for less). Amazon doesn't charge sales tax to California.
Are electric currents magnetic?
A magnetic field is always associated with a moving charge. So, if current is there, it must be showing the magnetic effects though these are too small of daily relevance..
