a. A galvanometer has an internal resistance of 35.0 ohm and deflects full scale

Question

a. A galvanometer has an internal resistance of 35.0 ohm and deflects full scale for a current of 2.50 mA. Show how to convert the galvanometer into an ammeter that deflects full scale for a current of 5.00 A. (For full credit, both a picture and a calculation are needed.) b. A car battery has an emf of 13.4 v and an internal resistance of 0.035 ohm. Find the terminal potential for the battery when it is producing 120 A of current. 7. (12 points) In a region of space, the potential at point A is 6.00 v, and the potential at point B is -19.00 v. a. What is the change in potential energy for an electron [q = -e, m = 9.10 x 10^-31 kg] in moving from point A to point B? What is the change in kinetic energy for an alpha-particle [q = +2e, m = 6.68 x 10^-27 kg] that moves from point A to point B? (13 points) A battery and resistors are connected

Explanation / Answer

7 .

apply Potentail eenrgy U = Vq

where V is potential and q is charge

so

Change in PE = dV * q

PE = 6-(-19) * 1.6 e-19

PE change = 4 *10^-18 Joules

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PE change of He is   2*1.6 e-19 * ( 6-(-19)

PE change = 8*10^-18 joules

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