A charge of $12 C$ $12 C$ is passing through points A and B on a circuit. If the charge's electric potential changes from $70 J$ $70 J$ to $34 J$ $34 J$ , what is the voltage between points A and B?

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Answer 1 · 2017-07-20T16:05:50

Lets see what information we have :
Charge (C) $= 12 C$ $=12C$
At $A$ $color(blue)A$ , eletric potential energy ( $E$ $E$ ) $= 70 J$ $=70J$
At $B$ $color(red)B$ , electric potential energy ( $E$ $E$ ) $= 34 J$ $=34J$
Change in $E$ $E$ $= 70 J - 34 J$ $=70J-34J$ $= 36 J$ $=36J$
Formula relating those informations $\to$ $rarr$ $E =$ $color(green)E=$ Charge (C) $\cdot$ $*$ potential difference (V)
Therefore,
$E = C \cdot V$ $E=C*V$
$36 = 12 V$ $36=12V$
$12 V = 36$ $12V=36$
$V = \frac{36}{12}$ $V=36/12$ $= 3 V$ $=3V$ $\leftarrow$ $larr$

A charge of 12C12 C is passing through points A and B on a circuit. If the charge's electric potential changes from 70J70 J to 34J34 J, what is the voltage between points A and B?