Why does pressing one switch or the other affect the direction the motor spins? Select the best answer below. O Either switch will create a path to ground when closed, completing the circuit and allowing current to flow. O Both sides of the motor are connected to high potential through equal amounts of resistance. There is no potential difference across the motor until one side or the other is pulled low by closing a switch, causing a difference in potential across the motor. The direction of current flow through the motor will be determined by which side is pulled low. O With no available connection to ground, current is stuck in an endless loop. Since that loop is connected to high potential by two paths with equal resistance, the current is divided equally in both directions. Closing either switch creates a path to ground, allowing current to "exit" the loop like leaving a freeway. Current from the opposite side must travel further, weakening the potential on that side. This creates a potential difference across the motor in that direction, causing the motor to spin. O Only the side where the switch is closed forms a complete circuit, so the motor must spin in that direction.

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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.