Two 1kN resistors are connected in series from point A to point B; their junction is labelled C. Two more resistors are connected in series from A to B; their junction is labelled D. A to D is a 1 kN resistor while D to B is an unknown resistor R. A galvanometer is then connected between C and D, and a battery is connected across A and B. Finally, a potentiometer consisting of a 20 cm length of high-resistance wire, 25 kNm-1, with a sliding contact is connected, the bottom of the wire to B and the slider to D, in parallel to R. When the slider is 8 cm from the bottom, the galvanometer reads zero. i) Draw the circuit diagram. ii) Calculate the value of the unknown resistor R.
Two 1kN resistors are connected in series from point A to point B; their junction is labelled C. Two more resistors are connected in series from A to B; their junction is labelled D. A to D is a 1 kN resistor while D to B is an unknown resistor R. A galvanometer is then connected between C and D, and a battery is connected across A and B. Finally, a potentiometer consisting of a 20 cm length of high-resistance wire, 25 kNm-1, with a sliding contact is connected, the bottom of the wire to B and the slider to D, in parallel to R. When the slider is 8 cm from the bottom, the galvanometer reads zero. i) Draw the circuit diagram. ii) Calculate the value of the unknown resistor R.
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Russell E. Smith
Chapter11: Thermostats, Pressure Switches, And Other Electric Control Devices
Section: Chapter Questions
Problem 6RQ: True or False: A bimetal is a combination of two pieces of metal that are welded together, each with...
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