13. Power Source
Nowadays nearly everything you own requires a power source. Manual adding machines made way to scientific electronic calculators as did paper and pencil make way to tablet computers. All these new devices require power to operate. The Doctor has occasionally run into this problem and his solution is to use the screwdriver to power a device. The Fifth Doctor was the first to use the screwdriver this way to power the delta wave generator to help Nyssa overcome her exhaustion in Kinda . The Ninth Doctor used it to charge a cellphone battery and The Tenth Doctor used it to power the DNA Sequencer in Daleks in Manhattan/Evolution of the Daleks . The energy of sound waves can be converted into electricity with the help of piezoelectric devices. These devices are mostly made up of crystals and generate electrical signals when exposed to the pressure from sound waves. With the proper fine-tuning both the voltage and amperes could be controlled by the screwdriver to perform as a power source of infinite variation.