A d.c. series motor connected to a 235 V supply takes 43 A at 950 r.p.m. The armature resistance is 0.16 Q and the field resistance is 0.13 2. If the torque for a second case is 194.63 N.m and the back emf for the second case is 213.85 v. How many % should the motor speed decreased to as * ?compared to the rated speed

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.