Thus, the insight here is that we can understand the unit amperes per meter, via duality, in the same way that we understand the unit volts per meter.
More, a current of magnetic charge has units of webers per second otherwise known as the volt. This is of course the dual of the scalar electric potential measured in joules per coulomb otherwise known as the volt. Magnetic charge has units of webers and the associated scalar magnetic potential has units of joules per weber otherwise known as the ampere. Allow any ground wire or other ground to contact either the I or S terminal of the amp gauge at any time. T-CDI-5x00-x0S - Compressed Air Flow Meter.
2pcs Digital Voltmeter Ammeter Dc 100v 10a Amp Voltage Cur Meter Tester Blue Red Dual Led Display Panel With Connect Wires. Just as the volt per meter is a unit for the strength of the electric field, the ampere per meter is a unit for the strength of the magnetic field.įor additional insight, take the duality further and consider the magnetic field due to a hypothetical magnetic charge (monopole). Help Please Volt Amp Meter Wiring Diagram. What is the physical significance of the unit ampere/meter in Reluctance of a magnetic circuit (\$R_M\$) is \$\dfrac = \oint_C \vec H \cdot d\vec l$$ The MMF is easy - it's ampere-turns (as opposed to H which is ampere-turns per metre). Reluctance (\$R_M\$ or S) is like circuit resistance - it indicates how much magnetic flux (\$\Phi\$) the ferrite will produce for a given magneto-motive-force (MMF or \$F_M\$). It would also equal 100 if there were one turn and 10 amps. If the length of the toroid were 10cm and you passed 1 amp through ten turns, H would equal 100. This naturally means that larger ferrites can "hold" more energy before saturating.Ī toroid or any closed magnetic material with decent permeability can be assumed to contain all the magnetic flux within the material. H, being defined as ampere-turns per metre, reduces if the length of the path of the lines of flux are longer and, the resultant flux density for a given magnetic material would be less. In a more complex transformer (such as an EI core) the "per metre" part shown as below in red:. In a closed ferrite inductor such as a toroid the "per metre" part is the nominal length around the toroid - fairly easy to visualize. In an inductor it's harder to see - the "per metre" part of magnetic field strength (H) relates to the nominal length of the path of the magnetic lines of flux.
In a capacitor it is easy to see that the electric field strength (E) has an obvious "per metre" part - it relates to the distance between the plates in a capacitor.
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