Hi,
yes sir i have two 1kohm variable register and i want to get 1.5kohm resistance to connect in series manner but i don't know how connect it
As FvM already stated:
A potentiometer is a 3 terminal device, as shown in your picture,
But you talk about a variable resistor, which is a 2 terminal device.
But you may use potentiometers as variable resistors.
Connection:
Input ... to upper potentiometer, upper terminal
Upper potentiometer, Lower terminal --> lower potentiometer, upper terminal
Lower potentiometer wiper --> output.
With this the upper potentiometer is just used as fix (non variable) 1 k resistor.
The lower acts as variable resistor 0 ... 1kOhms.
Resulting in a total resistance of 1k ... 2k depending on lower pot adjustment.
Adjust the lower pot to center position (assuming you have linear pots) to get a total of 1.5k.
Klaus