A 9.0 V battery supplies a 1.5 mA current to a circuit for 5.0 h.(a) How much charge has been transferred from the negative to the positive terminal?(b) How much electric potential energy has been gained by the charges that passed through the battery?

A heart defibrillator passes 12 A of current through a patient's torso for 3×10-3 s to restore normal beating of the heart. (a) How much charge passed through the patient's body? (b) What voltage was used if a total energy of 300 J was dissipated by the current? (c) Estimate the resistance of the electrical path through the person. State any assumptions made in answering this question.

@3

Lightning is a spectacular example of electric current in a natural phenomenon. There is much variability to lightning bolts, but a typical event can transfer 10^9 J of energy across a potential difference of perhaps 5 x 10^7 V during a time interval of about 0.2 s. Use this information to estimate (a) the total amount of charge transferred between cloud and ground (b) the current in the lightning bolt (c) the average power delivered over the 0.2 s.