# How To Solve Diode Circuit Problems In Series and Parallel Using Ohm's Law and KVL | Summary and Q&A

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October 31, 2019
by
The Organic Chemistry Tutor
How To Solve Diode Circuit Problems In Series and Parallel Using Ohm's Law and KVL

## TL;DR

Learn how to analyze diode circuit problems, calculate output voltage, and determine current flow.

## Questions & Answers

### Q: How do you determine if a diode is in the on or off state?

To determine the state of a diode, you need to consider the voltage required to activate it. For a silicon diode, it needs about 0.7 volts to turn on, while a germanium diode requires 0.3 volts. If the energy from the source is enough to meet these requirements, the diode will be on.

### Q: What is the formula to calculate current in a resistor?

The formula to calculate current in a resistor is Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). So, I = V / R.

### Q: How do you calculate the output voltage in a diode circuit?

To calculate the output voltage, you need to determine the potential difference between two points in the circuit. Subtract the voltage drops across any diodes or resistors from the input voltage to obtain the output voltage.

### Q: How do you calculate the total current in a diode circuit with parallel resistors?

To calculate the total current in a parallel resistor circuit, divide the total voltage across the resistors by the total resistance. This provides the sum of the currents flowing through each resistor.

## Summary & Key Takeaways

• This video provides step-by-step guidance on solving diode circuit problems, including determining if the diode is on or off and calculating output voltage and current flow.

• The first circuit example demonstrates how to calculate the output voltage of 11.3 volts and a current of 2.26 milliamps.

• The video also shows how to solve more complex diode circuit problems, including parallel resistors and multiple diodes.