More than one of a thing, performing the same task simultaneously
0
votes
4answers
90 views
Why is there current flow in the sub-circuits?
I'm struggling with the theory of this(unusual) circuit:
simulate this circuit – Schematic created using CircuitLab
The load receives no power at all, due to the voltages cancelling out, ...
-7
votes
1answer
34 views
How to find the current in a complex circuit with nodal voltage sources?
This is circuit. Not sure how to get V, and find current. Any help?
-4
votes
1answer
53 views
Parallel circuit power consumption [on hold]
The ceiling fixtures in the three bedrooms of a home are supplied by one 120 volt parallel circuit. Each fixture is equipped with four 100 watt lamps. What is the total power consumed by the bedroom ...
-18
votes
0answers
93 views
Ask solutions for some circuit problem [closed]
Hi~ I'm a student. I have some problems about circuit(converter).
plz solve these problems... T^T
Thanks genius guys.
0
votes
2answers
106 views
Why multiple capacitors in parallel? [duplicate]
Wondering why you would choose to use smaller capacitors in parallel vs one bigger one. Here's an example:
Multiple in Parallel
Page 4: One larger C
Is this a component size and track width ...
-2
votes
1answer
47 views
Find the total resistance of circuit with both series and parallel resistors
I found this circuit in a textbook, but I'm having a difficult time calculating the total resistance here. I tried using the formula for parallel resistors with the 3 resistors the the upper left, and ...
-2
votes
2answers
118 views
how to calculate voltage drop by a resistor/ circuit attached parallel to another resistor/ circuit?
On my battery eliminator, if I measure source voltage without any load, it gives the correct voltage.
But when I add a load, the voltage drops.
And if I short-circuit the 2 output-leads with a ...
0
votes
0answers
32 views
Finding the current through resistor in source free parallel RLC Circuit for t>0
My solution: Since alpha >w0, so response is overdamped.
Current through inductor:$$ Il(0-)=Il(0+)=6
$$Voltage across capacitor: $$Vc(0-)=Vc(0+)=0V$$
Current through resistor:
$$ Ir(t)=A1e^{s1t} + ...
0
votes
1answer
56 views
why add a resistor parallel to voltage source? [duplicate]
Sometimes I see a resistor parallel to voltage source (such as image below), isn't it completely useless ?
Edit: I see the other similar question now, but I think it doesn't have the right keyword ...
0
votes
4answers
110 views
Large parallel strings of LEDs
I want to drive multiple strings of XTE LEDs (total of ~36 LEDs). The relevent (-ish) specs are as follows:
I_f,max = 1.5 A
Desired I_f = 0.5 A
V_f = 2.94 V (0.5A @ 85C)
According to some ...
1
vote
1answer
44 views
Multiple DC Voltage sources in parallel
I'm building an alarm system (paradox EVO192 with ZX8 extension modules) and was hoping to have separate sections of the system each powered by it's own battery backed up power supply (something like ...
3
votes
2answers
44 views
Parallel input to serial output
I have been learning a bit about electronics. In particular I have been playing with the shift register 74HC595. Here I understand how bits are moved into the register serially, that is one bit at the ...
0
votes
2answers
64 views
What is the difference between charging batteries in series and parallel?
For example, if I have a charger that supplies 300 milliamps:
Will it take a bit more than 3 hours to charge a 900 mAh AA battery?
What if I have 4 AA batteries in series? Will it still take 3 ...
13
votes
3answers
314 views
How many MOSFETs can we safely parallel in condition of very high currents? I had problems with a motor application at 48V 1600A
I tried with some configurations in which 16+16 MOSfets of 240A each (really they are case limited to 80-90A because of source terminal, but i doubled this termminal with a very thick copper wire for ...
0
votes
1answer
18 views
AC voltage regulator in parallel
I have two voltage regulator which works on ac. They are both the same model and provide a maximum power of 3000w.
I would like to plug their outputs together to make a 6000w total voltage regulator. ...
1
vote
4answers
69 views
Basics physics question about calculating resistance
Why is the total resistance calculated differently when resistors are in parallel, compared to when they are in a series? For example, $$ \dfrac{1}{R_t} = \dfrac{1}{R_1} + \dfrac{1}{R_2} + \ldots + ...
1
vote
3answers
113 views
Two identical DC power supplies in parallel for redundancy?
I'm trying to design a power backup system for my saltwater aquarium. In short, the system will be powered by a 12VDC power supply while the mains power is on. On power failure, the system will ...
1
vote
1answer
68 views
What happens if you put two coils in parallel
I want to build an LC-Filter from a tutorial I found (German language, if anyone is interested, I'll add a link).
In that tutorial, a 330uH Coil with a max amp of 1A is used.
I have some 330uH ...
0
votes
1answer
43 views
How to sum resistors in parallel and series?
I know how to add resistors in parallel and resistors in series, but i don't understand how to differentiate between resistors in the format shown:
simulate this circuit – Schematic ...
-1
votes
1answer
38 views
What resistors to use for 60, 8000mcd LEDs, with 4 * 1.5v battery source? [duplicate]
I currently have 60 LEDs in a parallel circuit. I am using 4 1.5v batteries as the source. The LEDs have a forward voltage of 3v-3.4v (8000mcd, wavelength 460nm).
My questions are: Can I just use ...
1
vote
1answer
54 views
Parallel connection of two 2-ports
In the N-port theory, it says that the total admittance matrix for the parallel connection of two 2-ports is the sum of individual admittance matrices "if it is possible to connect them in parallel".
...
0
votes
3answers
112 views
When will parallel LED voltage drops become an issue
The following circuit will cause problems because of voltage drops:
simulate this circuit – Schematic created using CircuitLab
It should be changed to look like this:
simulate ...
3
votes
1answer
83 views
Is there a limit to the number of parallel LED if each has its own resistor?
I am building a circuit with 6 parallel LEDs, powered by 5 volts through a transistor array which can provide 300ma. If each LED is allowed 20ma (by setting the correct resistance for each), I should ...
-3
votes
1answer
54 views
Maximum inductance of parallel circuit [closed]
Three inductances, 1 henry, 2 henry and L henry are in parallel. Find value of L such that the equivalent inductance is maximum. At this value of L, what is the value of equivalent inductance?
0
votes
1answer
73 views
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 ...
0
votes
2answers
70 views
voltage divider in series and parallel circuit
I have these two series and parallel circuits and I want to know how I should find the voltage through R1, R2, R3 and R4. I know I should use the rules of voltage divider but I don't know how when I ...
1
vote
2answers
86 views
How do I calculate voltage using the complete diode method?
Doing extra examples for a electronics class, came across a section uses the Complete Diode Model (We haven't covered it in class in much detail, only the definition).
The question is: Determine the ...
0
votes
0answers
36 views
Operating different current batteries in parallel with a UPS
I have a 24V UPS and I use a pair of 12V batteries in series, each with the same current rating (130A). Often I charge the batteries with an external 24V charger to achieve a faster charging time.
I ...
1
vote
0answers
49 views
Wiring 2 audio output transfomer secondaries in series or parallel
I want to know if wiring 2 audio output secondaries in series is doable. See problems with this schem? Would parallel be a viable alternative?
0
votes
2answers
49 views
Connecting power sources in series or parallel?
Basic question:
Lets say i have two power sources, one supplying 1V and 100mA, the other supplying 2V and 200mA
What would be the difference if i connected them in series or in parallel?
As far as ...
0
votes
1answer
42 views
parallel rlc voltage source
I am learning about circuits and I have some questions regarding circuit
initial condition:
- no initial energy stored before switch is closed
- there is current at L1 at t = 0-
I am wondering:
...
0
votes
3answers
81 views
Should I wire my electrical actuators in series, parallel or a combination of both?
I'm working on a project that requires four (4) electrical linear actuators to work together. They must be driven at the same speed, simultaneously.
Let's assume that I have four identical actuators ...
-1
votes
1answer
49 views
Circuit redraw. Series and parallel resistors [duplicate]
I just wanted to ask you if I redrew the circuit correctly and if you could help me what to calculate first or if you could help me to redraw this circuit even simpler. And to tell me a few tips for ...
0
votes
2answers
65 views
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
-4
votes
1answer
75 views
Series parallel resistor. Circuit redraw
Can somebody help me redraw this circuit so it'll become easier to see what resistors are in series and what in parallel.
Thanks in advance
Have I redrawn the circuit correctly. Are R1 and R3 in ...
1
vote
1answer
152 views
eMMC interface : Parallel vs SDIO
I want to use an eMMC card for my application.
After searching on different websites,I was not able to find any parallel interface supported eMMC chip.
Is parallel interface available for eMMC ...
10
votes
4answers
802 views
Why do we use two parallel capacitors in a voltage regulator circuit? [duplicate]
C1 and C2 are parallel capacitors and their total capacitance is 1000.1 uF. I think C1 is ...
-4
votes
2answers
91 views
Wiring 5mm IR LEDs in parallel [duplicate]
Im trying to wire 9 5mm IR leds in parallel using a 9V battery. the forward voltage is about 1.5 and Im looking for about 100mA instead of the ussual 20mA with a standard LED.
When I punch these ...
3
votes
2answers
114 views
What Circuitry is needed to charge in parallel, but power in series?
simulate this circuit – Schematic created using CircuitLab
I've read several other battery posts, and didn't find the answer I was looking for. My question is, can the Diagram I've ...
2
votes
3answers
118 views
LEDs in parallel [duplicate]
If I have 4 identical* LEDs wired in parallel to a single resistor so that the overall current available is 30 mA, do I still run the risk of premature burnout? The LEDs peak forward current is 30 mA. ...
0
votes
1answer
80 views
Can devices be added in parallel indefinitely?
I'm assuming not, but say you added devices with the same resistance in parallel. All I've learned is that they would receive the same voltage and the current into and out of the voltage source would ...
1
vote
1answer
27 views
Photomultipliers in Parallel
I have a photo-multiplier going into a preamp then two stage shaping amp (PC250 and PC275 board from Amptek). The photo-multiplier is attached to a plastic scintillator and then a beta emitting ...
-3
votes
1answer
124 views
I want to use many parallel LEDs. Can this IC (BP3309) help me to control them? [closed]
I want to use many parallel LEDs. Can the BP3309 IC
(datasheet in Chinese)
help me to control the LEDs? I want consistent brightness.
2
votes
2answers
114 views
Help to join 3 resistors in parallel into 1 (power equiation?)
I want to join 3 resistors connected in parallel into one. Like this
If for the total resistance I use
Rt = R/3
But what about the power of them?
0
votes
2answers
78 views
Circuit analysis (Intro to Parallel Circuits & Series)
We are just in the beginning phases of learning how to simplify circuits by finding equivalent resistance. I've gotten every problem right except for this one. The answer says its 2000 ohms, but I ...
2
votes
2answers
210 views
Old Text Book Current Question [closed]
Can anyone help my 13 year-old with an assignment? I have little knowledge about electricity and I need to teach her about circuits. We have a question from her seventh grade science book that has us ...
-2
votes
1answer
98 views
Why is wiring some LEDs in series better than wiring them all in parallel?
I noticed a lot of guides for making an LED array or matrix prefer to wire their LEDs in series first and then wire strips of leds in series in parallel. What is the benefit of this Vs wiring them all ...
0
votes
4answers
163 views
Capacitors in parallel without resistance
For the following circuit, at time 0, the switch switches from A to B, figure out the voltage wave form at B.
The question I am concerned with is whether the voltage across the capacitors will ...
1
vote
1answer
89 views
Can i double max current drawn, putting batteries in parallel?
Im dimensioning a quadcopter,and from my math, everything will draw a maximum load of 58-63 A.
I need to choose Lipo batteries that can handle that current draw.
From what I know: Max current: ...
1
vote
2answers
57 views
Parallel Piezo Pickup Problem
I've an electronic drum machine - which involves electronic drum pads with piezoelectric transducers in them (which pick up you hitting the pads with your drum sticks) which feed into a magic drum ...
