• 25 V R D, D2 RL 12 V- 8 V= - 25 V
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.
Observe the given circuit. The diodes are attached to the positive and negative terminals of the battery respectively. This circuit can be used as a noise elimination circuit.
Assume that all the diodes are ideal.
Consider the positive half-cycle of the applied voltage, as the voltage at the anode of diode D1 is more than 12 V the diode D1 will be forward biased and the voltage of 12 V will be applied to the load resistor. Before reaching 12 V the output voltage will follow the input voltage.
Similarly, for the negative half cycle, till the applied voltage at the cathode of diode D2 is less than 8 V the diode D2 will be reversed biased and the input voltage will be applied to the load resistor. As the applied voltage exceeds 8 V the output will become -8 V because -8 V will be applied across the load resistor as soon as the diode D2 is forward biased.
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