If when you said "resistance" you actually meant resistor, this component is called a potentiometer (see image for an example).
If that is not what you meant, then I cannot begin to guess what you are referring to, as resistance is a quantity not a component and thus cannot have physical leads (and I have been involved with electronics since 1967 and worked in the field for 30 years).
Equation of Equivalent Resistance in Parallel is 1/Equivalent Resistance = 1/Resistance 1+ 1/Resistance 2 +1/Resistance 3If the resistance of the resistor is 3 Ohms then1/Req= 1/3 + 1/3 = 1/31/Req= 3/3Then cross multiply so3Req = 3Then isolate variable for Req (divide both sides by 3)answer1 Req= 3/3=1 OhmEquivalent Resistance is 1 Ohm
constant resistance variable resistance and accomodating resistance
a) fixed variable b) variable resistance c) body weight resistance
we use it when we require a variable resistance in a circuit
The test equipment needs two test leads to find the resistance in a circuit.
An independent variable is something that you, as the experementer, change to try and get a set of results. E.g, in an electrical ciurcut you may change the voltage to see how it affects resistance. Voltage is the independent variable as your changing it, resistance is the dependant variable as it changes due to the change in the independent variable.
Variable resistance.
It is a resistor which resistance is changeable, such as a potentiometer.
Three lead RTD is an industrial standard when a bridge arrangement is used. The advantage of this design is it distributes resistance due to the connecting leads equally to the adjacent arms of the bridge making lead resistance insignificant and avoids any error due the same. When it comes matter of using xtr we need to add lead resistance with the R4 as given in the datasheet of texas. This can be done by using a variable resistance for R4 and do change the R4 such that the output current becomes 4mA for lower bound of range.. (ie) (their is no need to use the 3 lead RTD for accuracy same accuracy can acheived here with 2 lead RTD. just by having a variable resistor R4)
The volume knob on an audio device (radio, TV) is an example of a variable resistor. A variable resistor is also known as a potentiometer.
The volume control knob on a radio is an example of a variable resistor. By turning a knob, the resistance is altered and the volume (or current) is altered up or down.
Connect a variable resistance across DC source (fixed ends of variable resistor or Rheostat) and take decreased DC output across its one fixed terminal and other variable terminal of variable resistor. Other method is connect variable resistor in series with DC output and load, vary the resistance and take decreased DC voltage as required.