All electrical devices within the spell's
area-lights, computers, cell phones, digital watches, and so forth-do not function for the
duration of the spell. The spell does not prevent devices outside of the
area of effect from operating normally, even if they are on the same electrical circuit as those affected. (Even if the spell is cast on a generator supplying power to devices outside the
area of effect, those outside devices continue to remain powered.) At the end of the spell's
duration, the devices operate again as if their operation had not been interrupted. (Computers do not need to be restarted, and clocks display the correct time.) Many sophisticated mechanical devices, including automobiles and aircraft, rely on electrical
components, and so are usually affected by this spell.