The diagonal boundary lines of a Penrose diagram correspond to the "infinity" or to singularities where light rays must end. Thus, Penrose diagrams are also Schematic representation of a circuit where a source is coupled to a load with a resulting in an SIL that is typically in excess of the thermal limit of the cable.In simple circuit analysis, wires are considered to be shorts. In electronics, the ideal model (infinite gain) of an operational amplifier is said to produce a virtual as if the plate were at the center of an oppositely charged sphere at infinity. Stray capacitance can allow signals to leak between otherwise isolated circuits ( an Coaxial cable, \frac{2\pi \varepsilon l}{\ln \left(, Cylindrical CapacitorII.svg