Physics Review Question

Unit: Electricity and Magnetism
Year: 1991 Question#: 28
Question: How much energy is needed to move one electron through a potential difference of 1.0 x 102 volts?

(1 ) 1.0 J
(2 ) 1.0 x 102 J
(3 ) 1.6 x 10-19 J
(4 ) 1.6 x 10-17 J

What is this question really asking?


Explanation by: Derek N

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Answer 1
1.0 J

INCORRECT
Try using the formula V=W/q and remember to convert 1 elementary charge into coulombs. return to top























Answer 2
1.0 x 102 J

INCORRECT

Try using the formula V=W/q and remember to convert 1 elementary charge into coulombs. return to top



























Answer 3
1.6 x 10-19 J

INCORRECT
This is the nember of coulombs in 1 elementary charge (or the number of joules in 1 eV) but it is not the answer you are looking for.

Try using the formula V=W/q and remember to convert 1 elementary charge into coulombs. return to top


























Answer 4
1.6 x 10-17 J

CORRECT
Using the formula V=W/q you get 100v=W/ 1.6 x 10-19 multiply 100v by 1.6 x 10-19C and work will equal 1.6 x 10-17 J return to top


























What's this question really asking?

How much energy do you need to move an electron across 100 volts?
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