Determine Vo for the following network.

[HebrewHammer]

Homework Statement

Determine Vo for the following network

[PLAIN]http://img535.imageshack.us/img535/7041/63014601.jpg.

Homework Equations

Too many to list I would think. I'm pretty sure I have to use KVL.

The Attempt at a Solution

My classmate told me the answer was 2.45V. I can't for the life of me get even close to this. I need some fresh ideas.

 

[trillebar]

There is a time-varying input voltage, so the output should also be time-varying. (At least in this case.) It could be useful to model the diode as a voltage source. You could use the principle of superposition to find the voltage over the resistor...

 

[HebrewHammer]

Think I got it,

Applying KVL

-20 + Vc - 5 = 0
Vc = 25V

The capacitor is charged up to 25 V.
Thevenin equivalent ckt of that portion of the network which includes Battery and resistor will result in RTH = 0Ω and ETH = V = 5V.

For the period t₂-t₃
Applying KVL
10V + 25 - v₀ = 0
v₀ = 35 V

What do you think?

 

[vk6kro]

Almost right.

You need to consider what will happen when the input changes.

 

[DeeNos]

As a scientist, my approach to solving this problem would be to first analyze the circuit using Kirchhoff's laws, specifically Kirchhoff's Voltage Law (KVL). This law states that the sum of all voltages around a closed loop in a circuit must equal zero. Using this law, I would start by identifying all the loops in the circuit and writing out the equations for each loop.

Next, I would use Ohm's law to calculate the voltage drops across each resistor in the circuit. Ohm's law states that the voltage drop (V) across a resistor is equal to the current (I) flowing through the resistor multiplied by the resistance (R). By calculating the voltage drops across each resistor, I can then use KVL to solve for the unknown voltage, Vo.

Additionally, I would also consider the current flowing through the circuit and how it is affected by the different resistors. Using Ohm's law again, I can calculate the total resistance of the circuit and use it to determine the total current (I) flowing through the circuit. This information can then be used to solve for Vo using KVL.

In order to verify the answer of 2.45V given by your classmate, I would recommend checking the calculations and steps they used to arrive at that answer. It is always important to double check and verify results, especially in scientific and mathematical problems. If the calculations and steps are correct, then the answer of 2.45V is most likely correct. However, if the calculations and steps are incorrect, then it would be important to identify where the mistake was made and correct it.

In conclusion, solving this problem requires a systematic approach using Kirchhoff's laws and Ohm's law. It is important to carefully analyze the circuit and consider all the different factors, such as voltage drops and current flow, in order to arrive at the correct answer.