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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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Realizing 2 Resistors are in series in an RC circuit

I understand that when the switch is open, the capacitor acts like an open circuit & therefore the current in the capacitor branch would be equal to 0. When I solved the circuit using nodal ...
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26 views

Considering power loss in a simple series connection due to cable

A friend and I are struggling on a simple electricity exercise: A heater is connected to a \$U = 230V\$ power network over a copper cable. The cable has a cross-section of \$A = 1.5mm^{2}\$ and a ...
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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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Series voltage reference unstable with a series resistor

I am using the MAX6035 as a 5V reference that draws 5mA load current. To protect the input from transient spikes, I thought a simple resistor and zener diode circuit would work well. I noticed that ...
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Problem with adding two counters in series on an FPGA

I am using Verilog in Lattice Diamond IDE with a lattice MachXO2 7000HE breakout board. I built a basic counter with a limit input which generates a variable period clock output. It works fine on its ...
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54 views

Current Transformers (CT's) wired in series for two meters or relays

I'm looking for a wiring diagram for the connection of two energy meters (or an energy meter and protection relay) in series to one set of 3 phase CT's, I've heard it can be done, is it S1 on the 1st ...
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27 views

Series voltage and voltage tester module

I have a question about battery tester module. I have in my hands a board that shows the capacity of a 3.7V 18650 LiPo, presumably by measuring voltage. It has 4 LEDs on it. If I hook this up to ...
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51 views

Series circuit LED controlled by Arduino schematic question

I'm currently making a project with multiple series circuits to PWM control multiple LEDs. I have figured out how to make it work with a transistor, however I was curious if this way would work as ...
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79 views

Auto Fuse Tap Parallel or Series

Am looking to use a fuse tap to run a dash cam. These are instructions https://www.lumision.com/wp-content/uploads/2015/09/Micro2-Fuse-Tap-Instructions-e1441486778366.jpg for a fuse tap and consistent ...
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34 views

Series or parallel tank circuit?

The secondary of a transformer with a cap connected across it - should it be considered as a parallel tank circuit or a series one? It looks like parallel, but in reality the voltage rises on it when ...
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105 views

Charging two 18650 batteries in series with a 5V USB wall charger?

I'm looking for a good and space-saving solution to charge two 18650 batteries in series. The project is a small boombox, using an amplifier board that works with voltages between 4.5V to 25V. The ...
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56 views

how to wire together multiple photoresistors to make one big sensor?

I'm using an esp32 dev board, and a bunch of 5v laser diode emitters pointed an equal number of photocell resistors across a plane. The goal is only to detect when any two or more beams break at the ...
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339 views

Impossible to find the energy stored in an inductor without resistance and given a constant DC current source?

Here's my circuit: simulate this circuit – Schematic created using CircuitLab After doing some series and parallel inductor combining I get the value $$L_{eq}=20.8 mH$$ My question is, how ...
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72 views

Finding voltage across capacitor in series and parallel

Here's my circuit: simulate this circuit – Schematic created using CircuitLab I want to find the voltage over the 20uF capacitor; however, what I come up with is 50V which does not seem ...
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73 views

Using relay contacts in series to switch DC loads

We are using relay DRM570110LT and We need to switch 3A @220VDC in the output when we have a DC load. As the datasheet for this relay says, the rated switching current is 5 A, but I've been told this ...
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60 views

Elements' order in a circuit

I was reading about source transformations and came across an example where there was a change in the order of two series elements, is this always possible? The same for in parallel elements but that ...
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60 views

One resistor in series and two in parallel for LEDs

So I've read that using one resistor to limit current to two or more LED's in parallel is bad practice, so I wondered what about this kind of circuit: Is this also bad practice? Each LED has it's ...
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77 views

Leds in series with buzzer without resistor

So I'm pretty new at this, so I'm sorry for any dumb questions/statements. I'm trying to build a puzzle box where you activate a circuit with a reed switch using a hidden magnet. Activating this ...
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189 views

Can I use 1N4148 diodes instead of a 1N4001 diode for reducing the speed of a 5V 1.8W fan?

Looking at this 1N4148 datasheet, it seems that the forward continuous current is 0.3A, thus 300 mA. So if I add two in series, I will get 600 mA. I want to use diodes to reduce a 5V 1.8W fan speed. ...
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79 views

Struggling with Thevenin Equivalent Problem

I had asked this question before and thought I had found the help I needed, but unfortunately I found myself unable to solve the problem fully when I attempted it. The problem: For the Thevenin ...
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1answer
72 views

How can batteries be in series?

If a battery looks like this: And a battery series looks like this: How is it possible for electrons to go from the positive side of one battery to the negative side of another battery and then ...
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73 views

how to control power within a triangle automatically

I have two mains powered extract fans with sensor operated controllers. I need to add a third extract fan that will run if either or both of the other two are on. How do I wire this so to prevent ...
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61 views

How to split up voltages

I want to power up bluetooth receiver module (input voltage 3.7) and audio amplifier module which accepts only 2.4 - 3.7 voltage, exceeding which already burnt the IC. So i got new one. I'm having 2 x ...
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158 views

What is the Gain, Input and Output Impedence in this circuit?

So I'm trying to know what the input, output impedence and gain is in this circuit To begin, I'm kind of confused since I don't know if those two resistors at the right are in series or in parallel.
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78 views

Wiring up a current limiting resistor with an IR LED burns of the LED

I have a 5V DC supply and i am trying to wire an IR led with a resistor in series to it. I have wired it up to a bread board as shown in the pic The current limiting resistor value is ~ 216 Ohm. ...
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95 views

Doubt with current across several resistors (serie) and Resistor Power Rating

I have read that the current that flows across a circuit of several elements connected in serie is always the same but, as far as I understand, resistors consume current and disipates it in form of ...
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98 views

Can I sum up multiple, alternating series capacitors and resistors like this?

When the components are between each other, can I sum up multiple, alternating series capacitors and resistors like this? Thanks.
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39 views

Neglecting certain elements in deriving the current of a series RLC circuit

The current at resonance in a series RLC circuit is described in the bottom derivation, along with it being plugged into the formula for finding the voltage across the inductor in the circuitw: I ...
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177 views

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 ...
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45 views

Why or when does battery capacity matter in a series circuit?

I have 3 sets of doubled 18650 cells from a laptop battery, and I gather that it can be dangerous to use cells of different capacities in series. This question is more about the theory than practice. ...
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113 views

What is the miminum voltage for series NiMH pack?

Suppose a pack of 8 AA NiMH cells are serially attached and its known NiMH cells should not go below 900mV per cell. Does this really mean the pack should not be discharged past 7.2v?
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91 views

High voltage input and low voltage capacitor in series safety

I’m working with a car battery that has a voltage drop when cranking the engine. As a result of this, the stereo restarts even though it was running already. To resolve the issue of stereo rebooting ...
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Why is this pair of electric brakes not working in series (as intended), but works in parallel?

My uncle has a 48V electric boom lift that sat for awhile and we're trying to get up and running again. We had a lot of stuff replaced and refurbished and we're almost there, but there's one last ...
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70 views

How is the power in induction heaters regulated?

While building an induction heater based on a series lc circuit i started to question myself how im going to control the power going into the lc circuit. Im planning on using a PLL driver to always ...
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32 views

pn junction in series i-v curve

If i have \$p^+n -pn^+\$ junctions in series how should the i-v curve look? my guess is that because they have the same orientation in the meaning of forward/reverse bias so it's should look like ...
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48 views

saftey wiring lipo's in series and parallel

I want to make sure I am being as safe as possible. I have 2 18650's wired in parallel and 3 of those pairs wired in series with a 3 cell BMS board. I also have a constant current driver at 700 mA ...
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121 views

Thevenin Equivalent Resistance of complex circuit

I'm trying to find the Thevenin equivalent of a circuit of which I have already found the Thevenin voltage. Unfortunately I can't figure out how these series parallel combinations work to find the ...
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65 views

What is the proper way to dim LED pods?

I am trying to properly wire and then dim Cree LED tri-pods (3 LEDs on a disk). The spec sheet appears to read that the way to connect 2 * tri-LED pods (6 individual LEDs in total) would be in series,...
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372 views

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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131 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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47 views

Confusion about inductors in series vs. combined

I suddenly was getting confused while reading about inductors. The formula for inductance I was using was the one like in the answer to this question. However, I have also read that the inductance ...
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2answers
74 views

Simplify a circuit with current sources

Can I simply the circuit in this way? If not, how then?
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2answers
72 views

How to Power 2 devices at different voltages with the same set of power source(batteries)

I'm just curious if it's possible to power 2 devices at different voltages with a set of batteries while making sure that the 2 devices makes use of all the batteries. I have here an illustration of ...
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70 views

Least sub-optimal configuration of flooded lead-acid cells with different capacities

I am aware it's best to use cells of the same capacity, same age, etc. However, until I can replace the cells I have I need to make use of these. The batteries I have are 2V flooded lead-acid cells, ...
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67 views

Three diodes in series rectifier

So, I want to make AC 220V to DC 220v rectifier. Can I use two or three diodes in series, because the reverse voltage maximum of one diode is about 60 volts?
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31 views

Complex Circuit - How to Find Parallel and Circuit

I’m confused which of these resistors are connected in parallel, and which are connected in series: That diagram above is simplified form of a more complex circuit. Anyone can help me figure out? ...
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1answer
429 views

Series-shunt feedback analysis

Microelectronic Circuits by Sedra/Smith present a method to analyze series-shunt feedback circuits by separating the 'A circuit' from the 'B circuit' in which h11 and h22 are consolidated into the 'A ...
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46 views

Power handling for series connected diodes

I guess it's a fundamental question... Let say I have a diode_1 that can handle 1W power and another diode_2 that can handle only 0.1W power. If these two didoes are connected in series (diode_1 ...
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191 views

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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How do I find the power factor and the equivalent inductivity value for this given scheme?

My exam is in 2 days and I just can't figure this thing out. I have the following scheme: First I was asked to find out the impedance, resistance and reactance of the dipole given below. This is what ...