Questions tagged [charge]

A fundamental physical property held by various particles, most notably electrons

Filter by
Sorted by
Tagged with
0 votes
3 answers
79 views

Charge "something" over a 10 second interval then dump the charge on a load. (Alternative to battery?)

I'm getting a limited current of about 10 mA from a 12 V DC source. I would like to charge "something" (anything but a battery) with this energy over 10 seconds, and then dump it to a 12V ...
zdanman's user avatar
  • 137
1 vote
1 answer
61 views

Piezoelectric Disk Charge Generation and Detection

I have a piezoelectric disk. I am trying to determine the sensitivity of this disk for the sake of making a charge model more accurate. The charge model in question: I have attached the piezoelectric ...
HFOrangefish's user avatar
5 votes
7 answers
1k views

Why is capacitor equilibrium based on balanced voltages and not balanced charges?

The problem below is from the electrical circuits chapter of Essential University Physics Volume 4. I am having trouble understanding the essential idea behind the solution. I initially tried solving ...
Saveer Jain's user avatar
0 votes
1 answer
41 views

Estimating lithium-ion battery run time at different voltages

A polymer lithium battery in a powerbank (marketed as 30,000 mAh / 3.8 V, 114 Wh), has an actual electric capacity of 19,944 mAh, and an energy capacity of 104 Wh as measured with a constant load ...
user3026965's user avatar
0 votes
1 answer
49 views

Signal conditioning of a piezoelectric sensor

I am currently working on a project that involves the use of a piezoelectric sensor which is of the ceramic type and produces charge when a force is applied. I want to convert this charge to a voltage ...
Hannan Ayub's user avatar
1 vote
5 answers
127 views

To what voltage will this capacitor charge?

To what voltage will the capacitor in the circuit here above charge? The circuit is fed by 10V DC. I=U/R=10/100k=0.1mA Voltage drop on the 10k is 1V. Will the capacitor charge to 9V or to 10V? Someone ...
Jan's user avatar
  • 43
0 votes
1 answer
66 views

How is the total gate charge of a MOSFET affected by the temperature?

For P- and N-MOSFETs, Vgsth will decrease (in absolute value) when the temperature rises. What is the impact of the temperature on the total gate charge for P- and N-MOSFETs? What is the order of ...
Rémi Baudoux's user avatar
0 votes
1 answer
29 views

Engine instrument panel with duplicate Charge light, one incandescent and the other LED [closed]

I have an engine in a boat. The ignition on switch, start, and heat are on a panel on the navigation desk. There is also a power LED, incandescent charge, and led oil light. All the engine instruments ...
Fiona's user avatar
  • 1
0 votes
1 answer
56 views

Can I charge laptop with wire 20awg

My laptop has a maximum power is 170W, 20V, and I often use it with max power. My adapter has a broken power jack and I must change the wire that supplies power for the charge. I use wire 20awg, the ...
Trà Nguyễn's user avatar
5 votes
4 answers
2k views

Why are smoothing capacitors useful/why do they work

Okay so from my understanding and looking at the equation for the impedance a capacitor has, the high frequency signals would be relatively easy to be sunk to ground (if the capacitor was grounded) ...
George kirby's user avatar
1 vote
1 answer
50 views

Using two TP4056 modules to charge two cells in series

Here's an attempt to get use two modules of charges to charge and protect each of its own batteries connected in series. Adding back-to-back P-mosfets and a shottky diode converts the whole system ...
Benzine 's user avatar
0 votes
1 answer
66 views

Calculate capacitor charging constant time connected to battery and boost converter

I know the formula to calculate the constant time for capacitor is t=RC and for full charge t=5RC. In the following example there is not resistor in the circuit but of course we are not in the ideal ...
Ahmed Mohamed Hassan's user avatar
1 vote
2 answers
205 views

Designing a Charge Amplifier Circuit in PSpice for Piezoelectric Sensor

I'm new to using OrCAD PSPICE 16.6 and need some help. I'm trying to design a charge amplifier for a piezo sensor before building the actual circuit. I've chosen a VSIN source as my input to represent ...
meadow's user avatar
  • 13
4 votes
2 answers
263 views

What is the charge stored in the equivalent capacitance?

Three capacitors C1, C2, and C3, whose values are 10 µF, 5 µF, and 2 µF respectively, have breakdown voltages of 10 V, 5 V, and 2 V respectively. For the interconnection shown, the maximum safe ...
dijkstra's user avatar
0 votes
0 answers
74 views

Delay-Free Switched-Capacitor Integrator Difference Equation Derivation

I want to derive the difference equation of a delay-free SC integrator using charge-domain analysis. Here's the example I am following. This shows you that for charge domain derivation, all you need ...
Leonhard Euler's user avatar
0 votes
0 answers
35 views

Will the laser beam of a laser printer make the OPC drum more positively charged or more negatively charged [duplicate]

while I was tutoring students about A LEVEL computer science in chapter 3 -- hardware, I found a very interesting question about printer. Some websites say that the laser beam could remove charges on ...
Jack don's user avatar
1 vote
1 answer
126 views

Why is resistance (inversely) proportional to area instead of circumference?

TL;DR From the Veritasium-vs-ElectroBOOM debate about the 1 m / c question, it seems to me that most properties about conductors depend only on surface charges. So shouldn't quantities like resistance ...
eccentricOrange's user avatar
0 votes
1 answer
144 views

Propagation speed and capacitors charging speed of transmission line

I am a bit confused on the speed of voltage propagation in the transmission line and I hope someone can enlighten me. I understand the speed of step up voltage propagation is in the same order as the ...
eyew18's user avatar
  • 1
4 votes
2 answers
143 views

Electric field of line charge and coaxial conductor

I'm currently having trouble understanding why the electric field inside a coaxial conductor (assuming that the charge is evenly distributed on the inner and outer conductor and opposite signed) is ...
Janik's user avatar
  • 91
1 vote
0 answers
145 views

Using an RC delay circuit on a MOSFET Gate

I have 24v Input from push button, I want to make delay when I leave the button and the PMOS will stay on for about 0.6sec. Attaching some timing diagram for the required operation signals (pay ...
Knowledge's user avatar
  • 401
1 vote
1 answer
104 views

Strange capacitor charge / discharge oscillations - SPICE

With this setup ngspice produces, for an 1ms dip-to-zero spike, this output Voltage source pwl(0 15 1m 15 2m 0 3m 0 4m 15 5m 15 2 15) r=0 If I make ...
kellogs's user avatar
  • 1,062
0 votes
0 answers
40 views

Solar panel help

I already have a solar charge controller connected to my solar panels protecting the attached batteries from overcharging. However I'd like to charge a second battery bank without connecting it up to ...
Mike's user avatar
  • 1
0 votes
0 answers
56 views

DS3231 module li-ion charging circuit tweak

Most of the DS3231 modules come with a "charging" circuit for a LIR2032 battery. I understand that, as-is, it's considered garbage. The reason people say not to use the module as-is is due ...
Mike Anderson's user avatar
1 vote
1 answer
92 views

Transient Charge Density in Conductor

Veritasium's (Derek Muller's) video How Electricity Actually Works makes the claim at 4:44 that: The truth is, if you average over a few atoms, you find the charge density everywhere inside a ...
Math Keeps Me Busy's user avatar
0 votes
1 answer
100 views

The two capacitors are in series but positive end of one plate is connected to positive end of the other

Like the title says, my task is to find the initial voltage across the terminals. The two capacitors are in Series with positive end of one plate connected to that of another. The given information ...
RK Eshat's user avatar
  • 143
0 votes
0 answers
83 views

Increase in voltage on filter capacitor

I am making a simple power supply that uses a transformer of 220 to 12-0-12, I am using the following diagram below: The circuit gives +ve and -ve voltage. The problem is that as I turn switch on it ...
user avatar
0 votes
2 answers
66 views

Calculating charge current of a bypass capacitor, choosing series resistance

I'd like to switch power supply of two sensors, each of them with a bypass capacitor at their supply pin, with an ATmega328P MCU output pin with an absolute maximum rating of 40mA. The sensors ...
Torsten Römer's user avatar
0 votes
0 answers
79 views

Optimize a design for current/charge oscillator

I'm trying to understand how to design a circuit that cycles charges between two capacitors between cycles. Basically I want a large positive current pulse into one cap at the same time a large ...
lurscher's user avatar
  • 139
-1 votes
1 answer
123 views

Transformer in a 2-3A charger

I have opened one of my phone charger to check the transformer used to provide an output of 2-3 A. I am a bit surprised regarding the size of the transformer. It is very small and the wires in the ...
user avatar
-1 votes
3 answers
64 views

How is charge limiting achieved in laptops? Why does it cause heating when limit is reached?

Laptops have this feature which allow you to limit battery charging to up to a certain percentage. Electronics wise, how is this charge limiting achieved? Is there actually a proper relay cutting off ...
everythingtrashthesedays's user avatar
0 votes
1 answer
85 views

Cheap China solar water pump kit only runs for 10 minutes [closed]

I checked everything with a multimeter, everything seems fine. The batteries charge to full capacity. The output from the solar panel seems correct. The output from the controller seems correct. In ...
Matthew Nisbett's user avatar
0 votes
1 answer
66 views

Charge on capacitors in circuit

I have this circuit with defined components specifications: R1 = R2 = R3 = 100 kΩ C1 = C2 = 1000 μF C3 = 4700 μF U = 24 V First question is to calculate the charge on each capacitor. I managed to do ...
Matjaž Meža's user avatar
0 votes
0 answers
36 views

48 V LiFePo4 BMS charge cycle

I have a question around BMS charge cycle stability. I have a 48 V 250 Ah LiFePo4 battery connected to solar system with a 5.5 kW hybrid inverter. The battery specs are 57.6 V float and max charge and ...
pietvr's user avatar
  • 1
1 vote
1 answer
192 views

What is the total charge Q of 1 m³ of copper?

I was wondering if I can calculate the total charge Q of 1 m3 of copper, see my calculation in the picture below. Is this correct? The correct solution (thanks to the community in the comments below):...
Marco Moldenhauer's user avatar
0 votes
0 answers
50 views

Calculate potential between two rods

Suppose we got four thin, long and parallell conductors with charges shown in the image below. Each conductor has a radius \$ r\$ and length \$ l\$ . Our problem is to find the potential between the ...
Tanamas's user avatar
  • 313
0 votes
4 answers
963 views

Why does a smaller capacitance equate to a larger voltage drop physically?

I was hoping someone could explain practically/physically why a smaller capacitance has a larger voltage drop than a higher capacitance. The equation is V=Q/C, so based on that it's very easy to see, ...
Justin Montego's user avatar
0 votes
0 answers
63 views

How to make parallel piezoelectric/PVDF transducers for force measurement?

I am having difficulty in understanding a concept since I am not in the electrical field. I am working on a project to measure the dynamic force on a surface using embedded PVDF transducers. Based on ...
Ali's user avatar
  • 1
1 vote
2 answers
89 views

Making a powerbank using lead-acid batteries [closed]

I have three 12 V, 12 Ah deep-cell lead-acid batteries wired in series that were used for a scooter. I’d like to repurpose this battery pack into a powerbank that can be used to charge electronic ...
Andrew's user avatar
  • 11
0 votes
0 answers
41 views

Is this charge pump analysis correct?

Assume switch on resistance is 0. Also assume that phi1 and phi2 are non overlapping clock signals and that the initial condition of all caps is 0V. My final answer suggests that Vout/Vin is 2 only ...
AlfroJang80's user avatar
  • 3,103
5 votes
4 answers
1k views

Reasons to use charge amplifier?

Here are some preliminary information before asking the question: When piezoelectric force sensors are subjected to a stress, they produce a charge that is proportional to the force. The amount of ...
floppy380's user avatar
  • 1,835
-1 votes
3 answers
266 views

What's the difference between electricity charge and signal?

To better understand the difference between electricity charge and signal, I would like to know in which kind of case is electricity charges actually used, and in comparison, in which kind of case is ...
DevonDahon's user avatar
0 votes
1 answer
86 views

Which drains first when connecting Battery A -> Battery B -> Load? [closed]

I have two large commercial USB batteries I need to combine to produce power for a 10hr period. Each alone can power my load for ~6-8 hours. Reading a few other articles: Can batteries be charged and ...
David Parks's user avatar
0 votes
1 answer
130 views

RS310 DC power supply charging 12 volt car battery

I am trying to charge a car battery with a Rockseed RS310P power supply. I set the voltage to 14.5 V and the amps to 2.0 A but when I connect it to the battery and turn it on the current drop to a ...
ds1234's user avatar
  • 3
0 votes
0 answers
38 views

Battery capacity evaluation

To measure NiMH battery capacity, everything I've read so far indicates that in order to get an accurate evaluation you have to measure the discharge parameters. I can understand that, however in my ...
Philip Grimado's user avatar
0 votes
1 answer
140 views

Switched capacitor circuit - polarity of charge

Consider the following situation: There is a capacitor C1 (polarity does not matter). The 'top plate' of the capacitor is the one at the top of the diagram and has two ideal switches connected, one ...
AlfroJang80's user avatar
  • 3,103
0 votes
3 answers
100 views

Is there a force when electrically charged particles are around DC current?

Is there a force when electrically charged particles are around DC current? I mean that if there are statically charged plastic particles in the switch, is it easy to move into the contact or not due ...
Ahn JIn Ho's user avatar
1 vote
0 answers
40 views

How to calculate accumulation charge concentration (/cm3) as a function of dist. from the oxide-semiconductor interface in a MOS cap with n-type semi?

I am trying to calculate the accumulation charge concentration (/cm3) for the MOS capacitor with Au/TiO2/n-InSb, where n doped InSb is the substrate. So far the material I found focuses on p-type ...
Kirtankumar Pravin Dixit's user avatar
0 votes
0 answers
54 views

Trickle charge or maintaing charge with drone motor?

I'm wondering if there is anyway to make a drone self charge while flying it without losing much performance? I know this could not work to completely charge but even if some type of trickle charge or ...
Alex Sebright's user avatar
0 votes
1 answer
192 views

MPPT solar charge controller - battery charge current at MPP

I am currently planning to design an MPPT solar charge controller and I am trying to follow a reference design from TI - TIDA 010042. I am planning to use arduino as the microcontroller for this ...
fedi makni's user avatar
0 votes
1 answer
121 views

What is the mechanism for charge distribution in an infinitely long conducting wire?

If we supply along conducting wire conductor an AC supply, is the charge distribution inside the wire similar to the image given below? Also, do electrons push each other to generate this charge ...
Mrunal Shinde's user avatar

1
2 3 4 5
9