explain 1/r in electrics?

Answer 1

If you mean R as a resistor:

According to Ohm's Law electric potential difference(V) is directly proportional to the product of the current(I) times the resistance(R).

V = I R

The relationship between power (P) and current and voltage is

P = I V

Using the equations above we can also write

P = V2 / R

and

P = I2 R

Resistance of Resistors in Series

The equivalent resistance (Req) of a set of resistors connected in series is

Req = R1 + R2 + R3 + - - -

Resistance of Resistors in Parallel

The equivalent resistance (Req) of a set of resistors connected in parallel is

1/Req = 1/R1 + 1/R2 + 1/R3 + - - -

Answer 2

This is the reciprocal of the electrical resistance and is known as the conductance. If the electrical resistance of a conductor is high, then it's conductance is low, and vice versa. The unit of conductance is the "siemens" and is given the symbol "S". It was formerly called the mho, or reciprocal ohm.

Answer 3

If r is resistance, then 1/r is conductance.

Think of it like this-:

As r increases then the total of 1/r decreases - which makes sense, more resistance = less conductance.

Similarly it works the other way round, as r decreases then 1/r increases, thus as resistance decreases conductance increases.

In V = I x R, if the resistance gets larger, then the potential V must increase to maintain the same amount of current 'I'.

Answer 4

R, or resistance, is a measure of how hard it is to push electrons through a conductor. Big R means very hard.
1/R is the opposite, called Conductance. As the value of conductance gets bigger, it becomes easier to push electrons through the conductor (wire, component or whatever).

Answer 5

its the conductance. you can use the conductance to work out the resistances of a load of parts in parallel. what you do is get the conductance for each part add them and then do 1/ the answer to return to the resistance.

conductance btw is how easy it is for the current to flow (as opposed to resistance which is how hard it is for it to flow). think of it in terms of pipes and water a large pipe means more water can flow or a larger conductance means a larger current can flow.

Answer 6

It's to do with resistances and working out resistance in a circuit, for its uses and other helpful electric things go to

http://www.intute.ac.uk/sciences/reference/physdata/REF_1.html

Additional: I think it applies to parallel circuits rather than series.

Answer 7

Conductance, measured formerly in mhos now in Siemens.

Answer 8

What is r ? Is it resistance?