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OHms you are familiar with but what is meant by MHOS in Electronics parlance?

Updated: 12/9/2022

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∙ 11y ago

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ohm (ōm)

n. A unit of electrical resistance equal to that of a conductor in which a current of one ampere is produced by a potential of one volt across its terminals.

mho (mō)

The SI derived unit of electrical conductance, equal to one ampere per volt. It is equivalent to the reciprocal of the ohm unit. Also called siemens.

The mho is an obsolete unit of measurement for conductance, which is the reciprocal of resistance. It has been replaced, in SI, by the siemens (symbol: S).

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How does the total resistance in a system change when additional resistance is added in series?

Sneighke answered: This discussion adds to the original question There are two types of resistance topologies: 1) Series and 2) parallel. To answer your question, resistance added in series always ADD together increasing the total resistance of the circuit. Conversely, adding parallel resistance reduces the total resistance of the circuit. So, for series circuits, R(total) = R1+R2+...Rx Parallel circuits are the exact mathematical inverse. The easiest way to determine parallel resistance is to add the inverse of resistance which is conductance, conductance being 1/r and is stated in Siemens (hold the jokes!...), then taking the inverse of the total conductance to convert back into Ohms. For example, if you have three resistors R1, R2, and R3, and they are parallel connected, the total resistance of the circuit is the inverse of the sum of conductance which would be written as 1 / (1/r1+1/r2+1/r3). By definition, conductance is the inverse of resistance. An example: Given three resistors of 5, 100, and 500 Ohms, In series, R(total) = 5+100+500 = 605 Ohms. In parallel, the total is always less than the lowest resistor: Converting to conductance (used to be called Mhos which is "Ohm" backwards, but has been replaced with the SI unit of Siemens): 5, 100, and 500 Ohms = 1/5+1/100+1/500 = 0.200+0.010+0.002 = 0.212 Siemens. Converting back into resistance, 1/conductance = 1/0.212 Siemens = 4.717 Ohms which as stated above, is less than the lowest resistance resistor. In fact, sometimes working with conductance is easier in series/parallel circuits and, in particular, calculating which values of resistors are required to yield a desired resistance; usually a non-standard resistance value needed for a specific purpose in a circuit. An example: Say you need a non-standard resistance of 698 Ohms. Since we know that parallel resistors create a value lower than the lowest parallel connected resistor, you would start with the next highest standard value and then add a parallel resistor to get you what you need. In this case, you would subtract the desired conductance from the starting resistor: 698 Ohms = 1/698 = 0.001427 Siemens or 1.4327 milliSiemens. If we had a standard value resistor of 750 Ohms (remember, you have to start higher): 750 Ohms = 1.3333 mS. To find the required parallel resistor to get us our 698 Ohms, subtracting the conductances 1.4327mS-1.333mS = 99.33uS (micro Siemens) [0.00009933 S]. Converting back into Ohms, 1/99.33uS = 10.07kOhms (10,070 Ohms) which is close to the standard value of 10kOhms. Doublechecking, Add the conductances: 10,000 Ohms = 100uS 750 Ohms = 1.3333mS Adding gives a total conductance of 1.4333mS. Thus the parallel equivalent = 1/Siemens = 1/0.0014333 = 697.7 Ohms which is within 0.04% of the 698 Ohms we need which is well within acceptable error and we have our 698 Ohm resistor by connecting 10,000 Ohms and 750 Ohms in parallel.

Related questions

What is mhos?

mkjj

What is the symbol for mhos?

upside down omega

What is hardness of cz and zircon?

It is 7.5 on the MHOS scale.

What is the hardness of cubic zircons?

It is 7.5 on the MHOS scale.

What is zircon's hardness number?

It is 7.5 in the MHOS scake.

Qual a condutividade eletrica da ligacao covalente?

15 Mhos.

What standard electrical measurement unit has replaced Mhos?

Siemens, unit: S. Named after Ernst von Siemens.

Can you put this in terms 168.2ms for conductivity that i can understand?

Siemens is a unit of conductivity - it is the reciprocal of resistance. Mhos is also used for this measure.

How do you convert from mhos per centimeters to microsiemens per centimeters?

mho/cm = S/cm = 10^3 mS/cm

How hard is gold on the hardness scale?

Gold ranges from 2.5-3.0 on the Mohs scale of mineral hardness.

How do you convert siemens to mhos?

You don't . . . they are the same thing. "Siemens" is the SI unit being used to replace the ohm. (Ohm spelled backward)

Why is conductance representted by the letter g?

No particular reason. Perhaps because the upside-down omega looks a bit like a gamma. Conductance in Mhos now is measures in Siemens (S).

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