# Tagged Questions

65 views

### Nodal analysis in simple circuit

I have a circuit to solve: In this approach, I inferred the V1 from the parallel connection of voltage source. For the second node, I have applied the KCL. I also tried to do it another way, by ...
122 views

### Homework - Find where the components belong

A black box has three electrical connections labelled A, B, and C, arranged in a triangle as shown below. The box contains three components: a resistor, a small capacitor and a diode. ...
180 views

### What mechanism happens inside a resistor for potential drop and constant current?

What process happens inside the resistor just after being connected to a battery? I am trying to get a picture of it. On applying a potential difference, the electric field it generates pushes the ...
103 views

### what if the Kirchoff Voltage Law were wrong? [closed]

how would that affect the definition of voltage?
111 views

### Does current source affect flow of current in circuit with a variable resistor?

Suppose you have a current source in series with a resistor R the current through the R resistor would be the current generated by the current source. How would the current through the circuit change ...
77 views

### If voltage is the same across each resistor in a parallel circuit, what's the point of resistors if there's 4 of them in a ciruit with 50volts

If voltage is the same across each resistor in a parallel circuit, what's the point of resistors if there's 4 of them in a ciruit with 50volts, it won't affect the voltage. I also noticed that when ...
256 views

### How do I determine the phase response of a high pass filter?

I am stuck trying to determine the phase response of a high pass filter. I was able to find the transfer function for the high pass filter and the magnitude but I am stuck finding the phase. I found ...
197 views

### Cutoff frequency

I'd say that the cutoff frequency of the circuit in the following scheme is given by $f_0=\frac{1}{2 \pi (R_1//R)C}$ but I don't know how to prove this idea. Do you agree with me? What would you ...
96 views

### Finding the total energy of the network in steady state

i got a network below in steady state im trying to find the energy in the network by the capacitors and inductors. simulate this circuit – Schematic created using CircuitLab My attempt ...
167 views

### Thevenin equivalent of a circuit

I'm trying to solve this problem, and i seem to be unable to solve it, part of the reason being that the there is a dependent current source in here, so I can't find the Thevenin equivalent resistance ...
76 views

### How to find τ in these circuits?

I know that $τ = \frac{L}{R}$, but what is $R$ in this formula? It seems to be the total resistance, but how to find it in the schematics?
261 views

### Calculation of cutoff frequency in larger circuit

I'm having some difficulties choosing appropriate resistors and capacitors to get specific cutoff frequencies. I guess it's because I'm just considering the single pole components rather then the ...
578 views

### Why doesn't the relocation of this resistor affect the circuit's total resistance?

Why does moving the 470Ω resistor in these examples have no effect on the total resistance between A and B? This is a new question regarding the answer given here by @helloworld992.
302 views

### How to calculate a simple mixed parallel/series resistor circuit

I'm trying to understand how to calculate resistance in simple mixed parallel and series resister circuit. Below is a question from a worksheet I've been playing with to better understand the topic ...
174 views

### What is a good electronics kit for the everyday inventor [duplicate]

I am looking for a good electronics kit with lots of capacitors, trimmers, resistors, pots, diodes, transisters, leds and laser diodes, timers(like the 555), inductors ICs and common microchips, LOTS ...
169 views

### Parallel resistor not affecting rest of the circuit

I have been asked the following question: The resistance, r, is not known in fig(1a), why does its value not affect potential at b? By Thévenin's theorem, any arbitrary voltage source can be ...
444 views

### How do you directly determine the approx. value of internal resistance of inductor in LC circuit

According to my calculation, it will take 0.005 seconds to charge this circuit to 8 Volts through the 50 ohms resistor. Using $$V_c = V_s(1-e^{-t/RC})$$ How do you determine the effective ...
646 views

### Connecting 5 12V LEDs in a parallel circuit

I recently bought 5 12V ultra bright LEDs (all identical), and want to hook them up to a battery pack of 8 AA batteries. So I figured I could just make five parallel circuits with one LED in each, and ...
766 views

### What is this resistor for in this circuit?

I am studying electronics and I am currently reading/working my way through "Make: Electronics" by Charles Platt. Here is one of the circuit diagrams that he gives for making a basic burglar alarm: ...
72 views

### Modifying an old phone to draw less power?

I have a phone that I would like to install in my car as a GPS tracker, using the following guide: http://gizmodo.com/5691724/how-to-track-your-vehicle-on-the-cheap I'd like to keep it hardwired to ...
242 views

### what is the magnitude of total voltage in the below circuit?

I was working on some RLC circuits and I found a question something like this. In series RL circuit, $V_R$ = 4V and $V_L$ = 3V. what is the magnitude of total voltage ? I just thought $V_T$ = ...
448 views

### Wheatstone circuit not functioning

I have 3 dummy strain gauges suffering no strain (all 120 ohms, G.F=2.1) and the fourth (same characteristics) is meant to pick up torque at 45 degrees on a rod. It has been verified on an external ...
405 views

### Can I connect ICs directly together

This is probably answered elsewhere but I can't seem to find it. I have a circuit which uses a Mega8 to drive a couple of ICs as shown in the diagram below. The ISP connectors in the diagram are: ...
236 views

### Thevenin Resistance?

I don't understand our professor's explanation for the answer to this problem: An LED is connected in series to a 150ohms pull up resistor and a MOSFET with drain-source resistance of 3ohms. The Pull ...
98 views

### Leveraging DC series circuit to power higher voltage LED panel

I have a IKEA RGB Dioder set where each channel requires 12Vdc (& 1.25W), I want to connect this to my Phidget LED 64 Advanced. Each channel on the Phidget can provide a maximum of 5Vdc with ...