Questions tagged [parallel]

More than one of a thing, performing the same task simultaneously

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Two Series RC circuits in parallel [closed]

I am trying to figure out a way to simplify the circuit shown below. The 500 Ω resistor is actually a relay. It's all 12 V DC, but at initial conditions C1 is charged to 12 V and C2 is not charged. Is ...
1 vote
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2 240v AC parallel solid state relays on 2 resistive loads off of L1 and L2

My hope is to keep the solid state relays as cool as possible by dividing the circuit load, it is duty cycled and will run up to 72 hours.
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65 views

Looking for examples of batteries wired in parallel

My kids are learning about electricity. Among their first experiences was connecting D cells to a simple bulb (not LED) and finding out what happens when the 2 batteries were wired in series vs. ...
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How to calculate total resistance and identify which resistors are in series?

How to calculate the total resistance and identify which resistors are in series? I'm really lost with this one. How do I properly read this?
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Which is better - series or parallel rectifier? [closed]

The idea for this question gave me the question Understanding positive and negative rectifiers. Here I want to summarize the ideas behind the two circuit configurations - series and parallel, hoping ...
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1 vote
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Understanding positive and negative rectifiers [closed]

How is the first circuit a negative rectifier? My thought is the current flows forward so the diode turned into a short and Vout is postive, and if current is reversed then the diode blocks the flow. ...
48 views

Rheostat with parallel resistor, how to make the taper more linear?

I'm using a 10k potentiometer wired as a rheostat in parallel with a 470 ohm resistor, because I need a (roughly) 500 ohm variable resistance in a circuit. The type of potentiometer I'm using is not ...
126 views

Why are the two resistors in parallel? They are next to each other, so they should be in series, right? [closed]

Why are the two resistors in parallel? They are next to each other, so they should be in series, right?
63 views

Using two "tool batteries" in parallel - Need a BMS?

I have built a Bluetooth speaker, which is currently powered by a single 18V "drill battery" (Bosch BAT609 battery, to be exact - each pack has 5 lithium ion cells, and I assume, its own BMS ...
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1 vote
64 views

When wiring batteries in both series and parallel to increase the V and Ah, is there a difference between series-parallel and parallel-series?

For example, to create a battery pack of 24 V and 24 Ah from four 12 V/12 Ah batteries what would be the difference in following two wrings. Figure A: First create 2 series strips of 24 V/12 Ah and ...
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If I connect 3 12V batteries in parallel to eachother, then connect them to the load, am I connecting to the Load in parallel or series?

I have 3 12V batteries. I have connected the 12V batteries in parallel to each other. I have 1 positive lead and 1 negative lead coming off to my motor. Am I connecting to that motor in parallel or in ...
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1 vote
53 views

Brushed DC-Motor with Shunt Winding running on AC?

Why can't a brushed DC motor with a shunt winding (stator and rotor windings are connected in parallel) run on AC? As far as I understand it, the stator current should switch polarity at the same time ...
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Can one boost converter power three 5 W loads in parallel?

I want to power three 12 V/5 W light bulbs in parallel. I have a 3.7 V Li-po battery which has a discharge rate of 20 A. I have an LTC1871 boost converter. Is it possible for me to power the circuit ...
1 vote
82 views

Parallel resistors circuit: remove random resistors and from the total resistance know which were removed

This is more of a mathematics question than an electronics one. With this circuit, I want to know the state of the switches above the resistors, without looking at them. The use case is that I have a ...
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How to combine or use batteries having different capacities?

I know that batteries can't be connected in parallel even though they are the same type (eg. Li-ion) if they have different capacities. I have several of those and want to use them to make a desk ...
50 views

12V and 24V battery system with charging

I am trying to make an electrical system for an automotive application. We have two 12V batteries. The car itself will run at 12V, all ECUs and components will operate here. The starter motor, however,...
70 views

Rigorous Definition of Resistors in Parallel when Circuit is Defined as a Graph

Sometimes electric circuits -at least the ones consisting of voltage sources, resistors, inductors, and capacitors- are defined rigorously as a graph, such as done here. Given the definition of a ...
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Resistor parallel to diode

How can a circuit where a diode is put in parallel to a resistor be described mathematically? Yes a solution would be to linearize the diode function in a specific point but in my case I need a ...
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6k views

Not understanding why these two resistors are in parallel

We are asked to simplify the following circuit: simulate this circuit – Schematic created using CircuitLab I argue as follows, in order upper-left, upper-right, lower-left, lower-right: ...
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187 views

Can you explain why doesn't current always go through the first part of a parallel circuit (without water or heavy math)? [closed]

I have tried to understand this over and over. I don't understand how current ever makes it beyond one branch of a parallel circuit. I apologize for the circuit if it doesn't make sense. I simply do ...
145 views

Controlling 230V LEDs with a single Z-Wave switch

I am trying to control two 100W LED security lights via a motion sensor. The motion sensor is a Philips Hue and runs on the Zigbee network, the LED’s are 230V. I have purchased a Raspberry Pi and ...
2k views

What is the reasoning behind parallel memory pinouts?

Many of the parallel memory chips I’ve come across have counterintuitive address line pinouts. Take the AT28C256 32KB EEPROM, for example: The data pins are in near-ascending order (only interrupted ...
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4k views

How do capacitors stop voltage spikes?

In circuits like the one below, I don't understand how the capacitor can handle voltage spikes. I heard that decoupling capacitors deal with spikes by absorbing more of the voltage, but I don't ...
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54 views

Replacing resistances with equivalent resistance

In the above original circuit,by node analysis,we see that $R_3$ and $R_4$ are in parallel combination. So we can replace the two with an equivalent resistance $R_e$. For that we need to remove ...
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Two motor controllers in parallel

Can I, when connecting two inverters (motor controllers) in parallel, control each current independetly? Also is it possible to charge a battery trough a inverter (motor controller) with both inverter ...
1 vote
75 views

What is the simplest way to wire two resistors to be controlled by one switch to have three possible resistances and an off position?

There is very little space in the equipment's cabinet. Just enough space for two power resistors and one switch. Can a switch like this be wired to for example provide (using two 50Ω resistors) ...
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Parallel/Series Resistors Voltage measurement

I want to know the value of the resistors here. There are three conditions in this picture. Its getting really hard to fulfil the correct resistor values. Thats why i decided to post it here
1 vote
46 views

Fairy light led strip in parallel gets dimmer near the end [closed]

I have a string of led Christmas lights. They are wired in parallel with two wires coming from the power supply and terminating in a single led. It's missing a power source so I'm trying to get them ...
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Problem 3.15 from Hyat: Engineering Circuit Analysis

Here is problem 3.15 from Hyat: Engineering Circuit Analysis. The goal is to determine current and voltage associated with each circuit element. On the right side author assigned current's direction. ...
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Why connecting two secondary windings together in an aiding dot-orientation parallel configuration will result in no output?

I need clarification on what would happen if the transformer is in aiding dot-orientation parallel configuration as shown below. Would that be the same as connecting two batteries, in parallel, as ...
197 views

LC Parallel resonance induction heater

Consider parallel LC resonance induction circuit with solid iron workpiece, inserted in the inductor. Is it possible to obtain more heat power output from the heated solid iron workpiece in the ...
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1 vote
131 views

Is it safe to connect CR2032 cells in parallel?

As mentioned in the title, I would like to connect two CR2032 cells in parallel to increase their capacity. If they are slightly different voltages then won't the better battery "charge" the ...
1 vote
97 views

BMS abnormal behavior

I would like to power the lighting system of a small cabin using 3 DeWalt 18 V, 5 Ah battery packs. The system consists of six 10 W bulbs each (12/24 V) and a 20 W, 12 V spotlight. DeWalt battery ...
20 views

Charging 4 parallel banks of 4 in series LifePO4, 16 total batteries. that have been top balanced

16 each LifePO4 batteries. 12.8Vdc 300Ah (Jita), an alleged internal BMS, charge by four SunGold Power SP6548 inverters, configured so two are providing 120VAC for phase 1 and two are providing 120VAC ...
79 views

What Interface is my LCD display using?

My Tektronix TDS 2024's 5.7” STN display (320x200, color) needs replacing. Instead using the same expensive, hard-to-find, obsolete one, it would be a good opportunity to upgrade to a more modern ...
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Battery and power supply in parallel

I have the following connection to power an AC load. Will it work at all? I am concerned about the following points: The battery may discharge to a low voltage and the power supply will charge the ...
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1 vote
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Building replacement 9.6 V NiCD battery pack for AN/ARM-186 aviation navigation system

I bought an AN/ARM-186 aviation navigation systems tester made by Rockwell Collins, but it used two 9.6 V NiCD battery packs and the last ones it had were thrown away. I have been unable to find old ...
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1 vote
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Battery configuration, simultaneously in parallel and series

Can someone please explain to me what would happen here? If you take two 12 V 1 Ah batteries and simultaneously connect them in series and parallel with diodes to prevent the shorts. At the ends you'd ...
1 vote
55 views

Why is the voltage dropping across my parallel circuit?

I'm building something and finding an unexpected voltage (DC) drop as I get further away from the power supply. I'm convinced I have a parallel circuit, but surely if I had I'd see a drop across the ...
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336 views

Does current prefer to take a series path over a parallel path?

simulate this circuit – Schematic created using CircuitLab Based on the simulation I have done, current here prefers to take the C1 - R2 path first and once C1 is saturated and cuts off it then ...
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Transformers in parallel

I Have an issue with an electric gate motor, it originally had a Toroidal 250va 13.5V. Naturally this is an unusual sized transformer and the space allocated makes a replacement difficult. The Unit is ...
1 vote
37 views

Connecting to two +5V sources on same rail to increase current for a eurorack USB power module

I'm very new to electronics and have basically no practical knowledge. I am hoping to modify a USB power eurorack module to to have more available current by connecting to two +5V sources on the power ...
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LEDs in parallel with no resistors

I know that if an LEDs are to be connected in a parallel circuit, a resistor must be added to limit the current rate flowing through them. But let's assume that I have blue LEDs with rated forward ...
77 views

Isolated two battery load/charging system (parallel 18650)

I am working on a project and wanted it to be very robust and user-friendly. To power said device, I had planned on using two 18650 in series (li-ion), like everyone else. The problem I had was that ...
154 views

Can I do voltage division for parallel resistors only?

I understand that voltage division is possible for resistors that go "one after another". However, I was asked to do this for resistors that are parallel. But I could not find any info on ...
1 vote
81 views

How to construct an integer based on the binary input of 8 to 32 GPIO pins

I'm researching a sensor for a project that has multiple methods of returning a value, one of them being a parallel output system that breaks down the value into 16 bit binary and transmits each bit ...
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2k views

Why is it impossible to connect these two doorbells in series or parallel?

I have: one 220 V AC -> 10 V AC transformer one push-button switch (at the door) two bells for two different places of the house; they should ring together when the (single) door push-button ...
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How to connect parallel variable voltage power supplies?

I have a small photovoltaic panel (PV) and a DC motor used to generate power and I wish to use them to recharge a small Li-ion battery. The specs are 5V, 500mA for the PV and 5V, 1A for the motor. ...
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If I parallel a 0 Ohm wire with another 0 Ohm wire conducting current in a circuit, what would the equivalent resistance of the two 0 Ohm wires be?

And what is the current distribution of each wire? I am wondering this question because the formula of paralleled resistance yields an undefined answer of 0/0.
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