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## Homework Statement

How can i convert V to eV in a problem?

I know that 1V=1.6X10^-19 J but I don't see how that can help...

Thanks.

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- Thread starter lha08
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- #1

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How can i convert V to eV in a problem?

I know that 1V=1.6X10^-19 J but I don't see how that can help...

Thanks.

- #2

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I think you have got your question a bit muddled up.It is 1eV that is equal to 1.6x10^-19J.

- #3

tiny-tim

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How can i convert V to eV in a problem?

Hi lha08!

V is voltage (potential difference), but eV is energy …

1 eV is the https://www.physicsforums.com/library.php?do=view_item&itemid=75" (ie energy) when an electron (whose charge you can look up ) moves through a potential difference of 1 V.

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- #4

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Hi lha08!

V is voltage (potential difference), but eV is energy …

1 eV is the https://www.physicsforums.com/library.php?do=view_item&itemid=75" (ie energy) when an electron (whose charge you can look up ) moves through a potential difference of 1 V.

So in this case, the charge of an electron is 1.60X10^-19 J...so is it impossible to convert eV to V? Not really sure...Thanks..

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- #5

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In this case, i use the formula eVo=hf-(work function)

then eVo=4.88X10^-19 after plugging all the values.

Need to find Vo: do i just need to divide 4.88X10^-19 by e (the electron charge 1.6X10^-19 J) and the answer will be in volts?

- #6

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So in this case, the charge of an electron is 1.60X10^-19 J...so is it impossible to convert eV to V? Not really sure...Thanks..

V (volts) measure potential difference (voltage). eV (electron volts) measure energy and can thus be converted to J (joules). V and eV measure two different things and therefore cannot be converted to each other.

Btw, an electron's charge is

- #7

tiny-tim

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So in this case, the charge of an electron is 1.60X10^-19 J...so is it impossible to convert eV to V? Not really sure...Thanks..

Nooo … the charge of an electron is in

J (joules) is

As

but V and eV are not units of the same thing …

eg you can convert metres to feet, but you can't convert metres to feet per second.

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