Question

U potential energy=k q1 q2r=V­1 (voltage)*q2 ; E_kin = (1/2) m v²

1) How much energy must a single electron have as it leaves a 1.5 V potential assuming it

started from rest? (an approximation of the batteries in lab)

2) How fast must that electron be moving as a result?

3) How much energy can that electron release before it comes to a stop, and why?

4) If current (I) is correlated to the speed of electron motion, then how do you expect

voltage (V) and current to be related? For example: V ~ I or V ~ 1/I. Why do you think

that might be the case?

5) If the electron experienced some force similar to friction or drag, would this increase or

decrease the electron speed? What would this mean for the current?

6) So, if the light bulb releases light as the electron passes through it, what does that mean

for the electron speed and energy? How would this then affect the current (this is related

to question 4)?

Answer 1

(1) - qov - 1.641019 1.5 (2.4x10-19 Joules Imre = 2.4x10-19 ve - 242.4x10-19 (2) 9.1x10 - 31 % = 17.26x15ml Lo speed of electron (4) Energy that must be released by electron before coming to stop = 2.4x10-19 Joules V x 1 ( voltage is directly proportional to speed of electron as well as Current) 5) If electron experariced some drag force, ethen its speed would decrease and hence current would be decreased due to drog sonce known as resistance.

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