A Temperature measurement system uses a sensing element A. The output of the sensing element is given in terms of resistance. This is given to the element B. The output obtained from the element B is analog voltage. This voltage is given to an element C. The output of C is Digital voltage.

i. Identify the name of the element A, B and C. 

ii. Also with a neat circuit diagram, explain how the analog is converted into digital . 

(b) List out the techniques used to convert digital into analog signal.