answersLogoWhite

0

Amperes of electrical current is analogous to pressure of water in a water pipe. The higher the "water pressure", the higher the amperage. An Ammeter ("amperage meter") measures "the water pressure" (the pressure of electrical current).

I use to teach Electronic Theory to Armature/Ham Radio operators and to computer techs at one company. So I can recite this suff in my sleep.

It depends on the kind of Ammeter you are talking about. There is one used for AC/alternating current and another for DC/Direct current. In DC measurements there is one or more resisters inside the meter. Usually precision resisters measuring less than an ohm. The meter measures the voltage drop across that resister and using the formula current(I) equals voltage(E) divided by resistance(R). It calculates current. Again this is for DC measurements This all comes from Ohms law. There are strict current limits for these meters too. For measuring High current you usually have to buy a special meter or a very accurate meter and an expensive & very accurate resister that looks like a copper bar. Also to protect this measurement circuit in the meters there is usually a fuse or the like Also many if not most meters have to be hooked up red to positive and black to negative. There may also be a diode or something to protect the meter from being hooking it up wrong. It will blow the fuse if you hook it up backwards. Warning! When measuring HIGH CURRENT the resisters get very hot rule of thumb the bigger the resister the hotter it gets.

For AC current measurement there is a ring on the meter that can open and reconnect around the AC wiring. There it does a similar measurement using an Inductive connection rather than a direct connection. This is the easiest way to measure an inductive load also.

Hope this helps.

User Avatar

Wiki User

14y ago

What else can I help you with?

Related Questions

What is the name of the meter that is used to measure current?

Electrical current is measured with an "ammeter". (The unit of current is "ampere". Measure it with an 'ampere-meter' ==> 'amp-meter' ==> 'ammeter'.)


What measures electric currents?

An ampere meter


What are two si units if measure?

Meter Kilogram Second Ampere


Example of fundamental unit?

Meter Kilogram Second Ampere Kelvin Mole Candela


What is The unit of pole strength in SI system?

The unit of pole strength in the SI system is ampere-meter (A•m).


How do you measure current passed through the load?

by connecting ampere meter in series with load.


What the measurement of units?

The SI has seven base units (kilogram, meter, second, ampere, kelvin, mole, candela), and lots of derived units - for example, meter/second for speed/velocity, coulomb = ampere x second for electrical charge, etc.


What is the SI units of measure?

The SI has seven base units (kilogram, meter, second, ampere, kelvin, mole, candela), and lots of derived units - for example, meter/second for speed/velocity, coulomb = ampere x second for electrical charge, etc.


What is a current measured in?

Ammeters (amps) An Ammeter is a meter for measuring electrical current, the unit of which is the Ampere (amp)


What is the SI units for expressing quanities?

Meter (m), kilogram (kg), second (s), ampere (A) and so on.


What are basic unit of si unit?

Kilogram, Meter, Candela, Mole, Kelvin, Ampere, and Second I believe


3 base units of metric measurement?

meter, kilogram, second, ampere, kelvin, mol, candela