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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Different and opposing voltage sources?

simulate this circuit – Schematic created using CircuitLab The diagram above, the voltage sources are equal and wired parallel, they would increase the current(2x) flow to the load(R), but what ...
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Calculating resistance of series/parallel circuit

If I have a configuration of 5 resistors as follows: simulate this circuit – Schematic created using CircuitLab How can I calculate the expected total resistance between A and B, given only ...
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460 views

Capacitors, ground between connection, Colpitts oscillator

For the Colpitts oscillator circuit shown (from a YouTube video), the video author said that the capacitors C1 and C2 are in series, which makes sense since there is a common connection point for C1 ...
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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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Watts - I think I'm getting free energy from a circuit?

Imagine I have a 10V battery with a capacity of 1Ahrs connected to a 100 Ohm resistor. I'll get 0.1A (V/R) at a power of 1W (current x voltage) for a total of 10hrs. As a watt is defined as J/s my ...
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Diode equation with a series resistance

i have this problem with a diode and a series resistance next to it. They ask me to calculate an expression for the diode current in function of the diode voltage. This resistance is a parasite ...
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Connecting two DC wallwarts in series - to produce dual DC supply

I have two 9 V, 300 mA wallwarts and would like to connect them in series to produce +9 V, 0 V and -9 V. This can be done with two 9 V batteries (as seen below), but can I do this with two non-...
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102 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 ...
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Equivalent resistance of resistors

Can somebody help me solve this. I need to find the equivalent resistance of these resistors. I really don't know where the trick here is. If somebody could help me I would really appreciate it
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diode and resistor in parallel with resistor

how do you calculate V\$_{R3}\$ in the circuit below? V\$_{in}\$, all the resistor values and the type of the diode are known. By simulating this circuit one can see that V\$_{D}\$ is increasing ...
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189 views

Wiring 3 Transformers in Series on 240V?

If I have 3 transformers (120V transformers) in series (on the input side) on a 240V circuit, will the transformers experience a voltage drop? If so, how much and will this affect the secondaries by ...
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Is there an optimal configuration or any way in which I can effectively connect

I currently have a 72V e-bike. The configuration of the batteries directly from manufacturer is 6 12v 20AH valve regulated lead acid batteries connected in series. In taking the limiter harness out ...
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Benefits of multiple op-amp gain stages in series?

I'm a bit lost in regards to how multiple op-amps in series will perform. My use case would be the amplification of low-voltage audio signals (4-50mVRMS) to roughly 8VRMS. I only found documentation ...
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Burned out filament but the light bulb has small resistance

The light bulb shown below is from a Christmas tree light string. The string is made up of series connected light bulbs. However if one burns out, the other bulbs keep working. Taking out the bulb ...
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Why do series combinations of Batteries not increase Capacity?

I've come to realize that batteries connected in series does not increase the capacity. But why is this so? This question explains that it doesnt Adding mAh when wiring battery cells in series?, but ...
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Tool for “designing” a resistor network?

I'm preparing to calibrate some current sensors for a system with DC 13.6V power, and various loads, from well under an amp, up to about 4 amps. I bought some 2, 3 and 5 ohm power resistors, and plan ...
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Is a two-element circuit series or parallel?

Is the voltage source in series with the resistor or is the voltage source in parallel with the resistor? If the voltage source is in parallel with the resistor, then why do they share the same ...
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646 views

DCDC converter in series

I need to convert 5V (main power supply) to +/- 30V. I have two +/-15V DCDC converters and was wondering if I can connect them in series to generate the +30V and -30V rail? My simple schematic I ...
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LED wiring questions with 9v battery as power source

My son is working on a project in which he is using 36 total LEDs consisting of 7 different LED's. There are 6 different solid colored LEDs varying from 1.88v to 3.2v and one color changing that is ...
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Circuit with 10 LEDs with 9V battery

I know that a 9V battery can only power so many LEDs. I need a 9V battery to power 10 of them maybe less or a few more and keep brightness and im not sure where to go to make it happen. Or if i ...
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Series resistor in data lines

Why is a series resistor used in high speed signal data lines? Is there any reason to include a resistor or simply protection from the receiver end? For example, I'd like to understand the reason ...
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Do batteries in series equalize charge

If I connect 8 batteries in series and two of the batteries are fully charged, while the others are partially charged, do the batteries eventually reach some sort of equilibrium?
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Do I Need a Series Resistor in Front of a Blinking LED?

I bought LEDs with a built-in chip which make them blink. The type of the LEDs are Kingbright L-56BSRD-B. The complete spec sheet is here. After reading the spec sheet I do not know if this LED needs ...
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Batteries connected both in series and in parallel

I am confused. Some sources say that connecting batteries in series also doubles the amperage (not only voltage) while maintaining the same mAh rating, while connecting them in parallel only increases ...
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Supercapacitors in series

Can I charge series of 4 Maxwell BCAP3000 supercapacitors with constant current method using an adjustable Power Supply, and exceed the voltage rated for single cell? What I mean is to charge the ...
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Finding current through LEDs in series-parallel circuit

I'm stuck confirming that the current pulled in a circuit will be 15mA. If I have hypothetical LEDs that pull 15mA each from 1.8V, and they are put in parallel (I know this is not a good idea, but ...
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Connecting batteries in parallel doesn't produce greater amperage

Having two 3.7V "3000mAh" Rechargeable Li-ion batteries, I tested connecting them in series and parallel. Using a multimeter, I measured the amperage of ...
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Extracting phase-shift and gain from a time series information

I have many files consisting input and output voltage signals for a linear filter circuit. For each file the input and output signal is at different constant frequency. All sampled for 2 sec duration ...
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Multiple Demultiplexers In Series

Basically I need some demultiplexers to switch between 24 outputs. The data inputs would be connected to counters for the addresses. I'm currently using 74ls138 3-8 line demultiplexers. Is this ...
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1answer
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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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773 views

How does the maximum current of solar cells combine in series?

Say I have one 4W PV cell and one 2W PV cell (both producing about .5V). I know enough to say that maximum current of the first cell is 8A (4 / .5) and the maximum current of the second cell is 4A (2 /...
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Connecting the primaries of two 110V transformers in series across 220V

I have 2 identical 110V primary transformers (plug packs but with a small transformer inside) for charging batteries in a pair of US made walkie talkies. Only issue is where I live now is 220V mains. ...
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368 views

Series capacitor equivalence

I have capacitors of 100uF, 10uF and 1uF; and need a series circuit with these capacitors to form a 0.1uF capacitor, is this possible?
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12V fan does not work when in parallel but does in series

I am building a food cooler for camping this summer. My plan is to build a thermoelectric cooler that is solar powered. My cooler is looking much like this: including a CPU fan on the hot side and ...
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Wiring Transformers in Series With a 240V Plug From a Generator?

How should I wire 2 transformers in series (either primaries or secondaries)(not sure which I should use) using a NEMA L14-30 plug from a generator socket? I'm using 2 Microwave Oven Transformers to ...
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9x 1W LED's parallel + series resistor calculation help needed

I am struggling with the calculations of the current limiting resistor for my circuit so I wanna ask you guys for help. I've tried doing this calculations on online calculators and by myself with math ...
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How Do Batteries Behave In Series-Parallel (Verify)

Hi I am confused about How batteries behave in series and parallel. I read online and saw that as you stack more batteries in series, the voltage adds together and the mA's stay the same, and if you ...
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Should Resistor be before or after an LED series [duplicate]

I am still trying to figure out the very basics of electronics, or certainly the parts I need to know for what I am trying to do. I've got the very basics (when it comes to using LEDs). + is Positive ...
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Converting DC to AC power supply [closed]

I have a simple wiring question. I want to convert a LED light that uses 2 AA batteries, to AC power supply. I have 3 of these lights. I'm assuming each light uses 3V for a total of 9V. I have a 9V ...