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Results tagged with high-current
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user 50733
Say how much current is required, high-current means different things to different people.
20
votes
How to measure current up to 1000A and not go bankrupt
Use several Hall effect sensors, arranged symmetrically round the bar, so that they add for the bar field, but cancel for external fields. Much the same principle as how a Rogowski Coil rejects extern …
- 185k
8
votes
Accepted
Driving a 5A current through a coil
The inductance of the coil at 15mH gives you a reactive impedance of about 280 johms at 3kHz. That's a larger impedance than your resistance, so will dominate the voltage you need across the coil, 5A …
- 185k
6
votes
Prevent 36V going through 12V, 30A circuit
There's no reason your welder and your 12 V supply should share the same terminals.
Whatever the present wiring of your 12/36 switch, it should be possible to rearrange it so that it selects one outpu …
- 185k
1
vote
High current draw at start up of DC motor. How to understand if the battery can withstand it?
If you are looking at 12v auto batteries, the 'cold cranking current' is the most appropriate battery parameter. This tells you what very short term current it can deliver to the starter motor without …
- 185k
2
votes
3 phase transformer to output 2 wires
3 phase to single phase is not possible simply, you would need a lot of extra stuff, like phase shifters (load sensitive), or motor-generator (big'n'heavy), or rectifier-inverter (the preferred route …
- 185k
6
votes
what is the temperature equilibrium for a copper conductor conducting 4000 Amps
If you know the viscocity, thermal conductivity and thermal expansivity of the oil, it should be possible to solve the free convection equations from first principles, and so work out at what temperat …
- 185k
4
votes
240V Mains - Current draw and when to use Solder vs Welding
It's more likely to do with manufacturing cost, multiplugs/boards are built down to a price. Once you're into manufacturing volumes, spot-welding is fast and can be automated.
- 185k
10
votes
2000A current sensing using STM32
The field from 2000A flowing in a conductor will be quite significant, and linear with the current. Just dangle an analogue output Hall effect IC close to the cable.
Better still, have two Hall effec …
- 185k
1
vote
How to calculate the size of copper strip with high current and high frequency?
I learned from the Internet that the safe current of 1 mm2 copper wire is about 4-5 Amps (DC).
Well there's your problem then.
4 to 5 A/mm2 is a rating, and a very conservative one at that. It makes …
- 185k
4
votes
Accepted
9v battery to power high current loads
is there a way to achieve high current pulses (1-2A)?
Yes. Just not many pulses, or very often.
A 9 V battery can supply a few 10s of mA continuously, let's say 20 mA comfortably1. That means you ca …
- 185k
6
votes
Does hot melt glue damage wire insulation?
Or is it the case that since wires are regularly soldered ...
There are wires, and there are wires.
PVC insulated wires do not take kindly to being soldered. PTFE or silicone insulated wires shrug i …
- 185k
2
votes
Too High Voltage Drop across Transformer's Output
Whereas it's true that you can over-current a transformer briefly and stay within its thermal limits, that doesn't improve the resistance of the transformer windings, which will still limit the maximu …
- 185k
4
votes
How would super high voltage and high amperage affect the number of windings in an electroma...
The limiting factor in most electromagnets is temperature. You can increase the current supplied to them, which increases the field, until the windings get so hot that the insulation is in danger of d …
- 185k
2
votes
Accepted
Relay to Tesla Coil
Yes. However it's not clear from your question whether you mean use the coil of the wire, or the wire. There are three ways I can think of.
1) Use the relay itself as a 'buzzer'. This was a popular w …
- 185k
7
votes
Why are the 10A inputs on many multimeters unfused?
10A won't go through the switch, so you need a separate input. Once it's separate, few people measure car batteries, and they're the only people likely to blow a 10A measuring shunt.
A fuse holder is …
- 185k