Physics is present in computers due to the circuits that are in computers. There are parallel and series circuits. Also while a computer is running electric currents flow from high electric potential to low electric potential. Computers have a battery in them which is the voltage source which makes the computer run and the electrons flow throughout the object. You could also connect a voltmeter and an ammeter to the circuit which would help you record the voltage as well and the amps traveling though the circuit board.