I need help with 4 and 6 please?

4. II In 1 second, a battery charger moves 0.60 C of charge from the negative terminal to the positive terminal of a 1.5 V AA battery. a. How much work does the charger do? b. What is the power output of the charger in watts? 5. 1 A 20 nC charge is moved from a point where V = 150 V to a point where V= -50 V. How much-work is done by the force that moves the charge? 6. | In a typical mammalian cell, the net transport by the sodium- potassium exchange pump that maintains the 70 mV membrane potential is 500 singly charged ions per second. How much work does the pump do each second? 7. | At one point in space, the electric potential energy of a 15 nC Section charge is 45 uJ. 15. 1I a. What is the electric potential at this point? id 16