An inexperienced mechanic is installing a 12-V battery in a car. The negative terminal has been connected. He is currently tightening the bolts on the positive terminal. With a tight grip on the wrench, he turns it so that the gold ring on his finger makes contact with the frame of the car. This situation is modeled in Fig. P9.69, where we assume that the resistance of the wrench is negligible and the resistance of the contact is as follows:
What power is quickly dissipated in the gold ring, and what is the impact of this power dissipation?