Final answer:
Yes, a switch with a current-interrupting capacity of 15 A will trip or interrupt the circuit if a 20 A current attempts to flow through it, preventing the higher current from flowing and protecting the circuit.
Step-by-step explanation:
If a switch has a current-interrupting capacity of 15 A, it is designed to interrupt or break the circuit when the current exceeds that value to protect the wiring and prevent overheating or fires. Therefore, if a 20 A current attempts to flow through the switch, it will indeed trip or interrupt the current, preventing the 20 A current from continuing to flow through the circuit. This is a fundamental aspect of circuit protection devices. Devices like fuses and circuit breakers are rated in amperes (amps), which signifies their maximum current carrying capacity before they open the circuit.