An electric eel develops a 420 V potential difference betwee…

An electric eel develops a 420 V potential difference between its head and tail. The eel can stun a fish or other prey by using this potential difference to drive a 0.80 A current pulse for 1.0 ms.  a) What is the energy delivered by the pulse? b) What is the total charge that flows?

In proton-beam therapy, a high-energy beam of protons is fir…

In proton-beam therapy, a high-energy beam of protons is fired at a tumor.  As  the protons stop in the tumor, their kinetic energy breaks apart the tumor’s DNA, thus killing the tumor cells. For one patient, it is desired to deposit 0.08 J of proton energy in the tumor. To create the proton beam, protons are accelerated from rest through a 8.0×103 kV potential difference. What is the total charge of the protons that must be fired at the tumor? 

Household wiring often uses 2.0 mm diameter copper wires. Th…

Household wiring often uses 2.0 mm diameter copper wires. The wires can get rather long as they snake through the walls from the fuse box to the farthest corners of your house. What is the potential difference across a 19 m long, 2.0 mm diameter copper wire carrying an 9.0 A current?  (Resistivity of copper = 1.7 x 10-8