Visitors can check out the Forum FAQ by clicking this link. You have to register before you can post: click the REGISTER link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. View our Forum Privacy Policy.
Want to receive the latest contracting news and advice straight to your inbox? Sign up to the ContractorUK newsletter here. Every sign up will also be entered into a draw to WIN £100 Amazon vouchers!
You are not logged in or you do not have permission to access this page. This could be due to one of several reasons:
You are not logged in. If you are already registered, fill in the form below to log in, or follow the "Sign Up" link to register a new account.
You may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.
I must be honest, in all seriousness it's rather puzzling how these jump starters with such large amperages aren't hideously dangerous.
I'd have thought that even 1000 Amps, let alone 10000 Amps, at 12 Volts across one's torso would be enough to instantly kill someone, and even fry them.
And it can't be that the current flows for only a nanosecond or something, because presumably the current must last a fair time to turn over a large vehicle engine.
The human body has a very high resistance. No matter what the amperage capability of a power supply, 12v will never cause a dangerous electric shock. Try touching both terminals of a car battery (or a jump starter) and you'll be hard pressed to feel anything.
Mains 240v is dangerous because, at this voltage, a few mA (milliamps) will pass through the body.
It is true that current (i) is what kills, and you don't need much current at all, but you need a high voltage (v) to overcome the body's resistance (r).
I must be honest, in all seriousness it's rather puzzling how these jump starters with such large amperages aren't hideously dangerous.
I'd have thought that even 1000 Amps, let alone 10000 Amps, at 12 Volts across one's torso would be enough to instantly kill someone, and even fry them.
And it can't be that the current flows for only a nanosecond or something, because presumably the current must last a fair time to turn over a large vehicle engine.
Leave a comment: