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-1 votes
0 answers
48 views

How do I increase the torque of my dc geared motor [closed]

I have been working on a project for quite some time now that uses a DC motor to spin a wheel that unravels a tape measurer (making an extendable lightsaber), and I have been running into an issue ...
Matthew Meerdink's user avatar
0 votes
1 answer
93 views

Is this PSU safe for this Christmas light string

I have an orphan 50 LED Static light string with label stating:- "Complete supply chain 3V, 1.5W, IP44" which has no power supply. I also have a power supply which is also orphaned i.e. it ...
six-h's user avatar
  • 1
0 votes
2 answers
64 views

Learning about DC voltage [closed]

I have a step up booster that increases my 36 V battery to 50.1 V. If I plug it into my 48 V battery which charges to 54 V it still reads 54 V on the multimeter. I'm wondering why. Could it be ...
Christopher Mahoney's user avatar
0 votes
1 answer
128 views

Solar panel output volts and amperes are higher than the battery but it won't power a small DC motor [closed]

Why won't my DC solar panel power a small DC motor when the output volts and amperes are higher than the battery that does power it? Thankyou everyone..Alot to review Regards
Matthew Nisbett's user avatar
1 vote
2 answers
140 views

Is there an electronic version of this mechanical system?

I'm asking this question in this way because I don't know any other way to explain what I'm trying to do. Imagine you have 2 gears, gear A and gear B, gear B is 3 times larger then gear A. So, if gear ...
Cyberstrator's user avatar
0 votes
4 answers
293 views

Switch that is rated for 24 V and 4 A: can it endure 8 A if I limit the voltage? [duplicate]

I have a switch that is rated for 24 V and 4 A. Can this switch endure 8 A if I limit voltage? What voltage would I have to limit to? My concern would be not to melt the switch with too much power. ...
vulubalulu balulu's user avatar
5 votes
3 answers
1k views

Effect of two welders working on the same piece

I am a beginner in arc welding and am fairly conversant in electrical concepts. I am told that two people working on the same piece do not affect each other. But my electrical background is telling me ...
user321732's user avatar
-1 votes
3 answers
3k views

How long would a 48 volt battery with 40 Ah last with a 2000 watt motor?

If it is not over 3 hours what would be good to make it last longer? I am trying to build a 48 volt dirt bike with 2000 watts.
Caleb's user avatar
  • 17
1 vote
4 answers
9k views

Getting 45.6 Ω when it should be 60 or 120 Ω on CAN bus

We have a 2011 Chrysler 6.1L Hemi SRT. We can not get any diagnostic reading at the DLC or OBDII port. We have checked all the wiring, fuses etc. Our readings at the DTC connector are as follows: CAN ...
Antony's user avatar
  • 19
2 votes
1 answer
67 views

Electrical Voltage Conversion Confusion [closed]

so my friend bought a drumset from America and had it shipped all the way here to Amman, Jordan. Of course im going to need a convertor for the voltage difference between the 2 countries. However I'm ...
Munir Awwad's user avatar
-1 votes
1 answer
71 views

Energy consumption Calculation

I work for a food processing plant and working on a project that calculates energy consumption. Am having a hard time converting information given by the manufacture to calculate the average kWh. ...
Daniel Salinas's user avatar
5 votes
5 answers
3k views

Why are high power LEDs categorized by wattage, not voltage & amperage?

In searching for the correct replacement LED for a project, I've noticed that, more often than not, high power LEDs seem to be primarily categorized by their wattage. Why is this the standard? It ...
b. insler's user avatar
  • 199
1 vote
1 answer
52 views

How to correctly wire LEDs and minifans into my greenhouse cabinet [closed]

I am building a small 4-shelf vertical indoor greenhouse. Each shelf has a 3-port USB hub-splitter which powers 1 USB minifan (5V, 1A) and 2 strips of 50cm USB LED lights (5V, 1.8A (30 * 0.06)). Then ...
DougN's user avatar
  • 11
2 votes
4 answers
739 views

Powering a 1 watt LED using a 3 V coin cell

I was hoping to power a 1 watt LED (would be great if this is capable of powering 2 or 3 watt LEDs) with a 3 volt coin cell. Will the coin cell be able to output voltages and amperages that are ...
Thomas Wood's user avatar
0 votes
0 answers
61 views

Chargers for modern devices, understanding compatibility

When a device (say a modern MacBook charger or GaN charger) lists modes, such as... ...
Woodstock's user avatar
  • 105
1 vote
3 answers
6k views

Is it wattage that kills you and not specifically amps

First of all the actual amounts needed to kill and the body resistance is not important for this scenario. Let's say we are working with dc. Let's say that 100ma is enough to kill across the chest ...
Alan Wolstenholme's user avatar
0 votes
1 answer
224 views

How to Calculate UPS Batteries DC to AC Efficiency?

For simplicity's sake, we will use this APC UPS for example: https://www.apc.com/shop/id/en/products/APC-Power-Saving-Back-UPS-Pro-550/P-BR550GI. It has 330W rating, loaded with 66 Watt-Hour (Volt-Amp-...
tonny's user avatar
  • 21
0 votes
1 answer
90 views

Basic question on Ohms law and current

I read that current is 'drawn' and voltage is 'taken'. Im learning basic circuits with an Arduino, and in one tutorial, a resistor is needed to take a 9v power supply and bring it to 30 milliamps for ...
Woodstock's user avatar
  • 105
0 votes
1 answer
67 views

Circuit design when using batteries [duplicate]

I'm new to making any electrical desings that don't have a manual. I have six 12 V 20 Ah Lead-Acid batteries connected in series. Can a 12 V 14 Ah or/and a 12 V 6.5 Ah battery(ies) be connected in ...
Graham McGoldrick's user avatar
0 votes
1 answer
80 views

Why makes ground "ground"? [duplicate]

We all know that birds don't get electrocuted while standing on a single power line, but if the bird touched the ground while holding the power line, it will die instantly. One thing that riddles me ...
Adam77's user avatar
  • 1
0 votes
1 answer
228 views

Why do solar panels need to be the same voltages when in parallel?

I have an off grid solar system which I reciently upgraded from 12v to 24v. I have two 12v solar panels which I put into series to boost the voltage to 24v (I will refer to this as a single 24v panel ...
Nectar-Bomb's user avatar
0 votes
1 answer
2k views

How to reverse a 240 single phase 7.5 hp motor

Trying to use a WEG 240 Volt electric motor from a IR compressor to power a different compressor pump. The electric motor is wired for CW rotation and I need CCW. The motor has 2 Start Capacitors in ...
Alex Petrov's user avatar
0 votes
2 answers
55 views

Wireless fast charging in car

For my phone I want to wirelessly charge my devices as fast as possible using the cigaret socket (Automobile auxiliary power outlet). I bought a wireless charging pad which on the back states. input: ...
Sven van den Boogaart's user avatar
2 votes
3 answers
340 views

240 volts circuit amp

Basic question, but I have a doubt! I have a pool heater that works from 240 volts. In order to calculate the annual operating cost, I installed a device that measures amperage and adds up the total ...
sylvain's user avatar
  • 23
1 vote
1 answer
247 views

Wheelchair battery life calculation

Apologies because I'm sure this is an incredibly basic question and I've tried to work out the answer myself but I'm getting nowhere with it! I'm looking to get a powered trike attachment from my ...
Amy Oulton's user avatar
6 votes
3 answers
3k views

Can I use 1000v rectifier diodes instead of 600v rectifier diodes?

I plan on doing some wiring but the directions are asking for 1A 600v rectifier diodes. I could only get my hand on 1000v rectifier diodes and before I continue I want to make sure this is safe as if ...
white_rx's user avatar
1 vote
0 answers
2k views

How to identify and wire leads on a one phase 6 lead, capacitor start, capacitor run electric motor

The leads are labeled U1, U2, U5, U6, Z1, and Z2. My research has found wiring diagrams on 4 lead motors where U1 & U2 are main winding and Z1 & Z2 are auxilary winding. Start capacitor wired ...
JIm Vann's user avatar
0 votes
1 answer
66 views

Discrepancy in my dB SPL calculations

Having read through this post I tried an experiment. I connected a Extech sound level calibrator to a Type 4189 microphone. The output sensitivity of the microphone is 50 mV/Pa,-26 dB ± 1.5 dB re ...
whoknowsmerida's user avatar
0 votes
1 answer
2k views

What defines volts, amps, watts and mAh?

My current understanding is as follows: volts: Speed of electron flowing. amps : Number of electrons flowing. watts: amps x volts measured for "some" time. mAh: Very confused to come up ...
Hank Moody's user avatar
0 votes
1 answer
117 views

How can I interpret the readings of a USB voltage tester considering the input voltage is 5V and I am charging a 3.7V battery?

I have this USB voltage tester that I place between my usb wall charger and a USB charging cable. This device gives me the total current that went through over a period of time. Let's say after 2.5h ...
Florin Mircea's user avatar
0 votes
2 answers
265 views

What is a kVA in simple terms, for somebody who doesn't know electrical engineering?

I have a DC circuit that runs on 8.1 A × 12 V (97.2 W). Power is supplied from a AC-DC transformer that plugs into a socket. How many of these can I run in a place that provides a maximum of three-...
Samid's user avatar
  • 141
0 votes
1 answer
2k views

To convert Volts in dB SPL confusion

I wanted to convert volts into dB SPL. Thankfully, I found this article convert Volts into dB SPL While trying to understand why he was adding the mic sensitivity along with 94 dB SPL, I found ...
whoknowsmerida's user avatar
1 vote
1 answer
451 views

Dual 50v DC boost converters in parallel?

I'm very new to electrical components, should I be on this website? I'm modifying an electric scooter to run at 50 volts as opposed to its rated 24 volts. The most I’ve seen the motor draw is 45 amp ...
Jake Warriner's user avatar
0 votes
1 answer
1k views

When I connect 2 motors to a battery do the motors share volts or amps?

That is, when I have an 8.4 v 3000 mAh battery connected to two of the same (DC) motor, is each motor getting 4.2 volts, 1500 mAh or both? Or am I just super confused?
gumboii's user avatar
0 votes
2 answers
84 views

How to get a Lipo to discharge at 3volts continuously

So let me start off by saying I'm brand new at this, but I'd like to learn. I have a 3v Motor that I need to run. I want to create a way to use a rechargeable Lipo to run the motor. How can I keep a ...
Darkvoidvz's user avatar
0 votes
1 answer
670 views

Amp draw at different voltage

I would like to power a 12 volt automobile radiator fan with a 110 volt generator. I need to know what the amp draw will be on the 110 generator. At 12 volts the fan is rated at 24 amps. If I use a ...
jim's user avatar
  • 1
-4 votes
1 answer
13k views

What's more deadly? Watts, volts, or amps? [closed]

This is a question I've wondered for years but not one person has been able to give me a short and sweet answer; from least deadly to most deadly, what's more deadly? Watts, volts, or amps? And what ...
Dan S.'s user avatar
  • 7
14 votes
3 answers
2k views

Standard Volt and Ampere

A recent question on here asking about how to calculate the accuracy of a circuit got me thinking about calibration in general. In particular, as EEs we routinely use volts and amperes as a unit and ...
Trevor_G's user avatar
  • 46.8k