Question 3 Calculate the resistance between points A and B (R) for the following resistor networks: Figure 1 All resistors S00 n Figure 2 Figure 3 All resistors 1 . B 2 k2 1000 4700 Figure 4 Figure 5 Figure 6 250 2 All resistors 2.2 kN •B 230A 470 470 2 330 Q 940 2 Lwifw

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A: Operational amplifier

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.