Piezoelectric quartz converts mechanical energy into electrical energy, but its efficiency is less than 100%. When struck with a hammer delivering 100 joules of kinetic energy, the output will be lower due to energy loss from molecular vibrations and internal resistance. Exact energy conversion rates depend on experimental conditions and the specific properties of the quartz. Some participants suggest that the impact may result in broken quartz rather than usable electrical energy. Overall, the efficiency of piezoelectric quartz in this scenario is limited.