Questions tagged [series]

In the case of an electronic circuit, series refers to components connected in such a way that current must pass through each in a single path.

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77 views

Why does LED dim when adding second LED in parallel with a single resistor

If I have a led hooked up to a 12v DC supply with a single resistor it runs nicely as you would expect. If I add a second LED in parallel the brightness drops, slightly, the brightness on both is (to ...
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110 views

LEDs in series without resistor

Say I have an ideal situation (good quality functioning power source and components) - 12V source and 3V (each) LEDs. Can I wire these 5 LEDs in series to the 12V source without a series resistor and ...
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1answer
140 views

How to wire several 78XX series regulators?

I have a 30V power source and I need to get several different voltages from it using linear regulator. 24V for op amps, 12V for relays and 5V for MCU. They all going to be installed on a heatsink. If ...
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26 views

Preservation of power when wiring batteries in series - battery life is reduced if load is kept the same

This is really just a "sanity check" type question. Am I correct that if you place two batteries in series, that the battery life is effectively halved relative to just one battery, assuming the load ...
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51 views

Question about purely resistive incandescent lamps put in series and fed double normal voltage

I am curious about how and why if you take 2 purely resistive incandescent lamps (light bulbs) that are rated at 40 watts and 60 watts, both 120V AC (RMS) ratings, if you put them in series and feed ...
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1answer
54 views

Series current calculations

simulate this circuit – Schematic created using CircuitLab My question is about elementary series current calculations. Above you see 3 circuits. All circuits have a Vin of 24v connected to ...
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4answers
91 views

What material can be used to connect nichrome heaters in series

I would like to run 3 heaters (26 awg straight nichrome wire with slightly different lengths) in series to form one continuous heater with 3 different temperature zones. All of the sections are ...
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1answer
34 views

Connecting a lower voltage load to a series of higher voltage batteries in halfway?

I have a battery supply source which is a series of lead acid batteries up to 72V. I have a 48V motor system (few kilowatts) and peripherals to be installed on to this power source. Due to limitation ...
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1answer
55 views

Series identical power supplies

Recently I made a thread about parallel supplies, however my helper fried one of them... Wonderful. So I got myself 4 of the famous DPS-1200FB-1 12v 100A power supplies. So I am an electronics noob, ...
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1answer
33 views

2 NMOS in series, connected source to source

I am working with DC2418A evaluation board (Link to datasheet is HERE) Schematic is on page 5 I am using version A, so we ignore Q1 My question is about Q2 and Q3: Why are they connected source to ...
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1answer
69 views

Is there a way to secure an 18650 battery pack together without soldering, spot-welding, or an end cap kit?

I'm putting together an 18650 battery pack for an e-bike. The BMS is specified for 10s 36v 40a. I want to avoid soldering, spot-welding, or an end cap kit if possible. I thought I would make each ...
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1answer
44 views

Question related to TVS Diode in series

I have a questions on my mind, and I hope that can be answered. The line to ground voltage is 54Volt, and I would like to know if it is possible to have two bi-direction TVS diode in series. I will ...
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1answer
68 views

Recommended design PWM-enabled driver for multiple 1W LEDs in series-and-parallel configuration?

A note on my background: I do have a degree in electrical engineering, but honestly I don't consider myself skilled enough to come up with designs from scratch, hence my post. Design Issue I wish to ...
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2answers
69 views

Is charge batteries in series faster than in parallel?

I would like to know if charging 7 lithium-ion batteries in series with BMS 7S are faster than simply charge them in parallel. Please for your advice, thank you!
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125 views

Connecting battery packs in parallel and series, each with their own BMS

Recently I bought cheap a lot of CASIO DT-9723LI battery packs. Every pack consists of 2 Sony 6th-gen Li-ion 18650 cells and its own 2s BMS. Here the question arises: Can I connect this packs ...
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1answer
36 views

In an open circuit, are capacitors still in “series”

In the picture below, there are two capacitors right next to each other in an open circuit (ie the wire with V2 written above it does not go to ground). Assume that each capacitor had been previously '...
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111 views

8 ohms and 4 ohms speakers wired in series - volume issues

I have two identical sets of ceiling speakers connected to a cheap 2 channel Chinese micro amp - one 8 ohms and one 4 ohms, wired in series per channel. The 8 ohm speaker is too loud when the volume ...
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75 views

Can a circuit have capacitors in both series and parallel?

From my understanding, two capacitors (or any electrical elements) are in series if the same current goes through them. Two capacitors are in parallel if they are connected to the same wires on both ...
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2answers
72 views

Switching between series and parallel battery connection

Previously I made same scheme (attached) but with two relays and it worked pretty well. Now I want to rebuild it with transistors (MOSFETs). The main purpose as I mentioned in the subject is to ...
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2answers
46 views

Pulse Down a line with Series terminations between transmission lines

I am interested in a relative edge case in transmission line of a simulation. If send a pulse down the setup below, now obviously my rudimentary steady state electronics knows this is a basic voltage ...
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1answer
91 views

What is the purpose of a resistor in series with a potentiometer?

I assume the 100 Ohm resistor is in series with the potentiometer so that the circuit is not shorted if the potentiometer has a value of 0 ohms, however, I know that will not affect the circuit ...
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1answer
43 views

Regulators lm75xx in series : 12v to 5v [duplicate]

What do you think about puting regulators lm75xx in series in order to get less heat loss as possible : 9v-- to 5v-- to 3.3v , to get 3.3v from 12v supply? The idea is to not using a switching ...
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71 views

Adding foot control to tig welder

I've got a simple tig welder that uses a switch on the torch to start the welding current and a potentiometer on the front panel to set the amperage. Many welders make use of a foot pedal to start te ...
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2answers
67 views

How to calculate voltage drops and power for a current dependent current source in series?

So the question goes as follows: For the circuit in the figure below determine: a) the loop current, b) voltage drops across all the resistors; c) voltage of the dependent current source, d) power ...
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2answers
57 views

Finding a current in a given circuit

The problem has given the following circuit: And asked to find the value(s) of Ix if the elements absorb the power(s) given. I tired to set up KCL/KVL but I keep getting stuck. I first drew this: ...
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1answer
43 views

Building DIY TrackIR, need wiring help

I'm attempting to build a homemade head tacking unit for use in computer games using infrared LEDs for my kid. I followed one tutorial where they were wired in parallel. After doing more research, I ...
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2answers
68 views

24V DC Power supply on the cheap?

I have an application where I need a 24V DC Power source at approximately 5 Amps (so approx 120 Watts). I've also got a shed load of old computers which all have 12V power supplies rated at up to ...
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1answer
119 views

LED light bulb in series or parallel?

I have been exploring how LED light bulbs work and the circuit inside of them. One particular question I have is how the lights are actually arranged? LIFX, for example, has 4 different types of LEDs;...
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4answers
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How do solar inverter systems easily add AC power sources together? [closed]

I understand DC power more than AC power. I know that given multiple DC power generators, easiest way to sum them is by connecting them in series. In paralel you'd need every generator circuit to ...
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1answer
89 views

60A current drain on supercapacitors in series?

We have a project to build an RC car from scratch and are only allowed to use NiMH batteries, no LiPo. We're hoping to power the car with an EDF (https://hobbyking.com/en_us/durafly-vampire-v2-rcaf-...
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8answers
981 views

Why does current not increase when batteries are connected in parallel?

I built a simple circuit consisting of two battery holders each including x2 1.5 V batteries, a slide switch, a LED and a 100 ohm resistor. The current I measured with a multimeter when the two ...
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73 views

24V supply run 12V 3014 LED strip in series; help with resistors for series

i need help with wiring up some pieces of a 12V LED strip in series to run on a 24V 150mA supply. i want to add resistors , to help keep the strings evenly balanced. i don’t know if it is necessary, ...
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1answer
53 views

Confused about proving series and parallel resistance equations

I am attempting to read through The Art of Electronics.In the early sections of The Art of Electronics the authors asks to prove the series and parallel equations. I am unsure where to start. I know ...
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5answers
191 views

When you connect two batteries in series, why doesn't the middle short?

When you connect two batteries in series, why doesn't the middle short? The connection between the positive terminal on one battery and the negative terminal on the other battery has no load, so ...
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1answer
61 views

Can I Connect Two Totally Different Transformers in Series?

I have 2 totally different toroidal transformers I want to put in series to make 75vac total. I have a decently large toroidal transformer in which I wound many, many turns of 10 gauge wire around. To ...
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1answer
69 views

Equivalent Impedance

I am unsure if I am approaching this problem in the most efficient and effective way. What changes can I make to my process of finding A and B? My next step was to turn into phase form so that I could ...
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2answers
102 views

Stove element as a resistor

I am wanting to use an inverter based TIG welder as a constant current power source for anodizing aluminum. The main hurdle I suspect I will be facing is that the amperage of the welder may be ...
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5answers
2k views

Heat lost in ideal capacitor charging

If we use an ideal capacitor to charge another ideal capacitor, my intuition tells me no heat is generated since capacitors are just storage elements. It shouldn't consume energy. But in order to ...
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3answers
140 views

Capacitor circuit simplification

I am unsure if I have simplified this circuit correctly, therefore I am unsure how to write Vo in terms of V1. Please let me know if I have simplified this correctly.
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1answer
91 views

Resistors in series and parallel conundrum

Three resistors of some resistance (ohms) are put in series and the measured total resistance is 24 ohm. Now, if the same three resistors are connected in parallel to each other and the total ...
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3answers
282 views

Is there a way to bypass a component in series in a circuit if that component fails?

Imagine a couple of speakers connected in series. Could there be a way to build such circuit with the ability to close the circuit if one component isn't working anymore? Like a different path that ...
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3answers
312 views

LED series-parallel and parallel-series combination circuit

I'm designing some LED strips to use to grow plants along a long wall. There will be hundreds of LEDs run by a constant-current high quality LED driver (Meanwell brand or similar). All the commercial ...
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1answer
68 views

Series connection of capacitors

I have some questions for the series connection of capacitors. It would be great if someone could help me get these. What will happen for the below cases when you have 2 capacitors in series and 2 ...
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1answer
24 views

Electron transfer and thermal efficiency in series vs single battery?

If you have 10 batteries in series all generating 5W, does every battery in the series have the same temperature as a single battery drawing 5W? I have trouble visualizing how the electrons travel ...
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2answers
116 views

Thevenins Theorem

Can someone please help, I'm struggling with this circuit. I don't quite understand what I need to do, mainly with whats series and parallel. My tutor is not helpfull in the slightest! He' only given ...
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0answers
12 views

Series + Parallel Custom Lipo Cell Charging Options

I have a custom LiPo cell, made up of 8x 11.1V 2200 mAh 30C bats. They are wired in pairs in series, and then all four ensuing sets are connected in parallel, to form a 22.2V 8800 mAh battery. I am ...
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111 views

Possibilities for 24v Solar charging of 12v batteries in series and parallel with different Ah capacities

I have two 12 volt 200Ah lead acid batteries and two 12 volt 150 Ah lead-acid batteries. I have a 24 volt 50 Amp charge controller connected to a 150 watt PV panel (overkill for now, but ready for ...
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148 views

Resistor network - how do I reduce this?

How do I find the value of this resistor network. Is the 10 ohm resistor in parallel with the 20 ohm resistor? Is the 16 ohm resistor in parallel with the 5 and 20 ohm resistors in series? I can't ...
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0answers
54 views

How to find the effective resistance across the points A and B here?

I had to draw the circuit and take a picture of it as I am not very educated with circuit drawing software. The circuit consists of 5 resistors with their respective resistances written beside them. ...
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3answers
73 views

Resistor in series needed with LED string?

I have an adjustable 24VDC power supply. I have 1W LEDs that I was planning on stringing 7 or 8 in series to get approximately 24V across all of them together. They are rated 3.3-3.8V each. Do I need ...