When an induction motor and a heater are supplied from a phase controlled single-phase ac voltage controllers, (a) only fundamental component of output voltage and current is useful in induction motor but fundamental and harmonics are useful in heater (b) fundamental and harmonics are useful in induction motor but only fundamental component of output voltage and current is useful in heater (C) both fundamental and harmonics are useful in induction motor and heater (d) only harmonics are useful in induction motor and heater

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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.