How much energy is needed to move one electron through a potential difference of 1.0 x 10^2 volts? Remember that the charge of an electron, e, is 1.6 x 10^-19 C?

Answer 1

We know, the voltage is the amount of energy lost or gained by 1 C of charge when it moves from one point of the circuit to another. Thus 100 V means 100J of energy is lost or gained by 1 C of charge,

Since the charge of an electron = 1.6 X 10^-19 C, Energy needed = Amount of charge X Energy gained by 1 C charge (i.e. Voltage)

= (1.6 X 10^-19) X 100 J

= 1.6 X 10^-17 J

= 100 eV