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Why is there a voltage drop across the resistor or diode in the circuit

 

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Voltage drop across a resistor or a diode in a circuit occurs due to the opposition offered by these components to the flow of electric current.

1. Resistor: When current flows through a resistor, the resistor converts some of the electrical energy into heat. This energy conversion results in a voltage drop across the resistor, as dictated by Ohm's Law (V = I * R), where V is the voltage drop, I is the current flowing through the resistor, and R is the resistance of the resistor. The voltage drop across the resistor is proportional to the current passing through it.

2. Diode: In the case of a diode, the voltage drop across it is due to the forward voltage drop required to allow current to flow through the diode. When a diode is forward biased (i.e., the anode is at a higher potential than the cathode), it allows current to flow, but there is a voltage drop across the diode due to the potential barrier that needs to be overcome for current to pass through. The typical forward voltage drop for a silicon diode is around 0.7 volts.

In summary, the voltage drop across a resistor or a diode in a circuit is a natural consequence of the resistance or forward voltage drop exhibited by these components when current flows through them.