When an electrical circuit is working properly , electrical current runs through that circuit, and much of the circuit is in fact a comparator made with discrete transistors. Given these facts, what has electrical current running through it when working properly among the following options:
- a hydraulic system
 - Marathon runners.
 - deoxyribonucleic acid
 - The bending of a ray of light
 - Electrical tape.
 - Discrete transistors.
 - Ocean currents.
 - electromagnetic energy


 

      Discrete transistors.   