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331 basic questions.

I am trying to run five vibration motors rated at 3.7 volts each on one switch. The power will come from a 12V, 40 Amp relay on my Jeep (SPOD). How can I wire the motors all together to turn on at one ...

Problem: Calculate the value of load resistance (Rl) for which maximum transfer occurs. Attempt: What I know is that for the maximum transfer to occur, the load resistance must be equal to the source ...

I'm studying electrical engineering and I've came to a problem, where I cannot proceed. It's a "simple" task, where we're talking about an inverting op.amp with 2 voltage sources, each 1V, while all ...

I am relatively new to electrical work, mostly stay on the software side of things. I recently soldered header pins onto a few led matrixes I have. They are 3 wire leds (power, data, ground). I'm ...

Can someone please solve this for me, telling me what's the right option and why? I will translate for you the question: "What is the reading shown by the voltimeter inserted in the circuit of figure ...

I bought a random thermistor for a circuit I'm planning to build and it turned out to be a NTC 5D-15. I'm trying to build this test circuit: After doing a bit of research, that thermistor resistor ...

Problem: An RC circuit has a time constant of 68 micro-seconds. The capacitor is charged to 14 V. How much is the voltage across a resistor after 136 micro-seconds of discharge? Attempt: What I know ...

Problem: Find the current that flows through the filament of a 400 Watts flat iron connected to a 220 volt power line. Attempt: The only formula I could think of that will connect voltage and current ...

Ive made my own 18650 cell tester that: Fully charges -> fully drains -> partially charges It takes 4 cells, measured independently of each other. While testing the drain circuits (charging circuits ...

How do I safely wire AA batteries to improve an Arduino-like device lifetime? Discussion here in the Forum [1] and the Battery University [2] suggests that using parallel AA batteries could be ...

I'm new to this field hence this weird question. Why would we need to ground an AC source? Why wouldn't it be enough to have just one pole to get an AC current going? I understand why it wouldn't work ...

I have been going through some past questions for my exam that is coming up this summer. I have come across this question which I originally deemed to be easy however the more I have looked over it ...

Understanding an N-JFET

2 answers, 250 views basic jfet
I am currently learning about FET transistors, and there is some things that I do not understand about an n-type JFET. I have two question about this transistor. Why is Vgs important and how do we ...

Suppose a TTL output in high impedance is connected to a LED, which is also connected to a resistor, which is then connected to ground. No circuit interferes between TTL output and LED, between LED ...

I'm new to circuits in general but have a basic understanding of it. However, it seems I can't wrap my head around the following issue: (I'm using Tinkercad Circuits for trying out different ...

N Mosfet basics

1 answers, 113 views arduino mosfet basic
Can somebody explain to me why this circuit will not work? It might be that IRF3205 isn't a great choice for an Arduino but it works for Adam Welch on youtube so it should be possible. Tried it even ...

If Conventional Current is backwards, how do I look at something like this schematic and trace the flow of current? I'd like to follow the design linearly from positive to negative. When the battery ...

I am having trouble dealing with this exercise. The data given is: \$U_G=110V, \: \omega=150rad/s, \: V_1=0V, \: V_2=5V, \: W=650W\$ Power factor =1. Being the power factor equal to 1, I should be ...

Why would this circuit not work as it is expected to work? The IC used in this is a 7408 AND gate.

If one was to power a (potentially) multi-amp device and an arduino with an external LM7812 12v voltage regulator to a 19v laptop charger (in parallel), would the arduino be safe when the multi-amp ...

I know that a regular summing amplifier does \$\ V_{out} = -(a*V1 + b*V2 + c*V3)\$ but how do I invert one of the gains?

I have an elementary question about current flow: If I connect a simple 1.5 V battery to a hypothetical LED of 1.5 ohm and an ideal ammeter, the ammeter would show a current of 1 Ampere and the LED ...

simulate this circuit – Schematic created using CircuitLab This is for a teen-level science fair type project. Materials include this 3V-12V generator and this 5V 1W heating plate Goal: 12V ...

[NOTE-This is a not a homework problem and i am not asking anyone to solve it] Recently I have been simulating some basic circuit analysis problems in a simulator to get a better feel of the topic....

Made a simple circuit with a reed switch, wall power source and LED strip (for a bathroom occupied sign). Worked as I’d hoped at first. But, after a while, THE REED SWITCH MELTS CLOSED--leaving ...

I can't make out what's in series and what's in parallel in this circuit. The solution I've thought of so far is to consider R1 in series with R4 and R2 in series with R5. Then, (R1+R4), R3 and (R2+...

Upfront: I am not an electrical engineer and therefore apologize upfront if I am asking a stupid question. TLDR; What are important / relevant metrics of high voltage power lines that can be ...

I have an early 70's Magnavox turntable/radio console that I want to be able to plug my smartphone into so that I can use it as an external speaker. I'm plugging into the Tape In input, which is an ...

How to find the (original) value of a burnt resistor? Let's suppose a condition in which initially I don't know the value of its resistance. Now because of its low watt, it burnt. So is there any ...

I feel like I'm making this more complicated than it has to be. If I have a 6v switch like this one, can I use it to turn on something like a 110v ~26A power supply? The current is far too high for ...

Sorry for the misleading title cause I have no electronic knowledge. It is a simple question. This is the circuit diagram. In case you don't see clearly, it is XOR GATE. My question is what will ...

Current Draw vs Voltage

2 answers, 81 views basic
How is it that by adding more components to a parallel circuit, the current at the root increases with no theoretical limit? Using the water flow analogy, you wouldn't find that the flow could ...

First of all I want to mention that I have no knowledge electrical field, so please forgive me if I will not be explicitly enough or I lack some terms, but I know no one with knowledge about ...

I have an N-channel MOSFET, part number IXFH30N50P. I am trying to use it as a switch for a 320V 8100uF capacitor bank. My idea is that I would have a separate, small voltage source, like a battery, ...

As I understand, a logic "1" output to an input of another IC can be modeled like this : simulate this circuit – Schematic created using CircuitLab with C1 representing output capacitance, R1 ...

Ive been studying Maxwell equations at school and I solved several excercises regarding electrostatic fields, however, I still have some very basic unanswered questions: When a non conductive object ...

I have a problem when calculating voltage over resistor because one method worked for one problem but not the next. I solved (b) like this: $$12-4=8V$$ $$8*\frac{60}{60+20}=6V$$ $$V2 = 6V+4V=10V$$ ...

This happened yesterday and left me scratching my head. We had a badly built power extension cord in our office. Inside it has 3 wires - live, zero and ground (hope I got the terminology right). When ...

I have a LM317T-based simple circuit and I'm using a 12V battery to power it. I connected the Vin to + 12V and made a constant current circuit as shown here. Now, I'm using a variable resistor of 100k ...

Perhaps I can best explain the question with two examples: (1) there is PC powered directly from 230V mains (unprotected by RCD or similar), and there is fault in PC that causes line voltage to ...

I'm reverse engineering a circuit in some industrial equipment, and I came across some curious behavior of the input circuit... The circuit is pretty simple, it is a resistor divider with a capacitor ...

I am a newbie trying to enter the world of electronics and currently struggling with getting a good grasp of basic concepts of electricity. I understand that electrons which usually produce the ...

I have very little knowledge of electronics, although I enjoy tinkering with basic electronics from time to time. If I have a battery of known voltage and I want it to light up a small 3mm led, I know ...

Combine two circuits

1 answers, 80 views basic
I want to apologize in advance for any ignorance throughout this post, I'm not anywhere near an electrical engineer. Basically I have a consumer which requires 220v and is not operating all the time. ...

I'm new here, and new to electronics in general. (for the most part … my [awesome] father had me building some simple Heathkit robots and panels with him when I was a kiddo, but I'm getting into it “...

How can one determine a current is AC or DC by use of an analog multimeter? Or its workaround with rudimentary tools or equipment ?

In electronics lab, while doing superposition theorem, we were asked to measure the current flowing through resistor and voltage across the resistor. As instructed, we measured the current by ...

I have a basic question on electronics. Why is it that typically a resistor is always in parallel to a current source and is always in series with a voltage source? As observed in Norton's and ...

I have a DC source where DC Voltage = Vdd and the current supplied by this source is rectified sine wave to a circuit. Now I would like to find the average power delivered by DC source. There are ...

I am new to electronics. I read electricity works this way: some atoms have more electrons than protons. These free electrons flow through a conductor such as a copper wire. However, to induce flow of ...

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