back to basics higher the volts lower the amps?

[chrisreid186]

hi guys

am i right in saying that generally the higher the amps the lower the volts ??

watts divided by amps = volts
watts divided by volts = amps
amps x volts = watts

taking that in mind a 12v extra low voltage spot light which is 50 watts = 4.1 amps

240v low voltage 100w bulb = 0.4 amps

if this is true wouldn't that make 110v more dangerous then 240v because of the high number of amps?? or is 110v not enough voltage to push the current through the resistance of a person. getting a bit confused any advice would be great. cheers in advance

 

[GStueyXR]

forget watts when talking about personal protection...

Each and every person has a resistance... Apply a voltage to that person, then the current that would flow would be governed by I=V/R. Making higher voltage much more dangerous.

According to your principles, I should have recieved a fatal shock today when changing my calculator battery.

 

[SEC-Tom]

WikiAnswers - What is resistance value of human body

Just out of interest is googled the resistance of a human body.

 

[chrisreid186]

i agree with the fact that 240 v is more dangerous then 120v

am i right about the relationship about between volts and amps , one rises and the other drops??

also i think all you need to receive a fatal shock is enough voltage to push about 60mA across your chest

a car battery is typically 12v 50 amps so more then enough amps but not enough volts
a static shock from carpet can be over 1000 volts but guess not enough amps

is this correct???

 

[Deleted member 9648]

Yes.......

 

[chrisreid186]

good now i can explain to my boss that higher voltage doesn't equal higher current

 

[Risteard]

a static shock from carpet can be over 1000 volts but guess not enough amps

Static electricity is both high voltage and high current, however the duration is very short.

 

[GStueyXR]

Static electricity is both high voltage and high current, however the duration is very short.

What he said.

Current is governed only by your resistance and the voltage applied....

BUT 1 AMP is 1 coulomb of charge per second. so if there is not enuff charge present then the flow of electrons ceases in an instant. So you never do get a high current shock from static, like my wife says 'it's all over too quickly'

Duration is the key to fatality.

 

[Deleted member 9648]

What he said.

Current is governed only by your resistance and the voltage applied....

BUT 1 AMP is 1 coulomb of charge per second. so if there is not enuff charge present then the flow of electrons ceases in an instant. So you never do get a high current shock from static, like my wife says 'it's all over too quickly'

Duration is the key to fatality.

Your wifes always telling me that too

 

[TobyTheSpark]

I believe it's something to do with getting shocked by 110v and only recieving half of this (can't remember the science why, maybe electrical seperation???) but 55v isn't enough tho penetrate the human body (60v minimum).
I think it's something along those lines.

 

[GStueyXR]

your wifes always telling me that too:d

lol.... :d

 

[GStueyXR]

I believe it's something to do with getting shocked by 110v and only recieving half of this (can't remember the science why, maybe electrical seperation???) but 55v isn't enough tho penetrate the human body (60v minimum).
I think it's something along those lines.

Hmm you'll be talking about centre tapped site transformers.

IIRC the centre of the seconday winding of the transformer is tapped to earth. 110V is induced on the secondary forcing the live to 55V and the Neutral to a not so neutral -55V giving a potential between conductors of 110V. So unless you grab live and neutral then the max you can get is 55 or -55.

 

[Risteard]

I believe it's something to do with getting shocked by 110v and only recieving half of this (can't remember the science why, maybe electrical seperation???) but 55v isn't enough tho penetrate the human body (60v minimum).
I think it's something along those lines.

Presuming you're referring to Reduced Low Voltage, it is centre-tapped with 55V to earth and 110V between live conductors.

 

[c.boy]

hi guys

am i right in saying that generally the higher the amps the lower the volts ??

watts divided by amps = volts
watts divided by volts = amps
amps x volts = watts

taking that in mind a 12v extra low voltage spot light which is 50 watts = 4.1 amps

240v low voltage 100w bulb = 0.4 amps

if this is true wouldn't that make 110v more dangerous then 240v because of the high number of amps?? or is 110v not enough voltage to push the current through the resistance of a person. getting a bit confused any advice would be great. cheers in advance

Voltages dont jump up and down!! you get a 230v supply or higher if 3 phase but the supply stays the same all the time!!! its the resistance you put in between the supply trying to get to 0 volts( potential difference) that causes higher amps!!!!!

 

[pmac10]

Voltages dont jump up and down!! you get a 230v supply or higher if 3 phase but the supply stays the same all the time!!! its the resistance you put in between the supply trying to get to 0 volts( potential difference) that causes higher amps!!!!!

which brings us back to answer number 1 by GstueyXR who also rightly pointed this out

 

[Crosswire]

good now i can explain to my boss that higher voltage doesn't equal higher current

But is does.

Assume resistance remains unchanged e.g. 10 ohms

230 volts divided by 10 ohms = 23 amps

2300 volts divided by 10 ohms = 230 amps

so the current in a conductor is directly proportional to voltage, and inversly proportional to resistance.

Can't remember who said that........

 

[SirKit Breaker]

Static electricity is both high voltage and high current, however the duration is very short.

But it has killed......

 

[GStueyXR]

But it has killed......

Really ? Cant see how that is possible unless the statically charged thing was a massive capacitor

 

[pushrod]

lightning is an example of a static discharge and that can certainly kill.

 

[GStueyXR]

lightning is an example of a static discharge and that can certainly kill.

But clouds have massive capacitance...