Failure is the key to success.
The purpose of a power failure light is to provide a light in case of a power outage. A light can be used to find the breaker box or provide safety in navigating in the dark.
An item designed for the purpose of unloading an air compressor at the end of a pumping operation or at any time when voltage failure occurs.
The purpose for the Embargo Act of 1807 was to ban trades between U.S. and other nation. It was a failure because it was a Financial Disaster for U.S. merchants
It aim to achieve high tolerance(low allowance). Thus the product does not undergo failure easily. It is called 6 sigma when it has only 1 failure per million.
If there is a way to fail on purpose, then failure is an option. But then again, to try to fail at something, you would be succeeding at failing. Its a paradox.
PFMEA is also called potential failure mode effects analysis. The purpose of PFMEA analysis is to take actions to eliminate or reduce failures, starting with the high priority ones.
The vent hole is referred to as a weeping hole. It's sole purpose is to indicate the failure of the water pump shaft seal. If there is antifreeze weeping from it, then the seal is leaking and the water pump needs to be replaced before catastrophic failure. Which is to say, replace the water pump now, before it becomes a more expensive problem.
The function of electrical insulation is to resist electrical leakage. Shorting and personnel injury are effects of its failure to perform that function.
The purpose of computer consultant insurance is to protect a business from being sued if negligence or failure of specific duties have occurred. Examples of this are if a consultant lost client data, software or system data, etc.
The mission system was used by Spanish Mexico to colonize the territories in the North. It wasn't a failure but was shut down after it had served it's purpose.
router
It's when a failure of one circuit leads to another circuit to fail. This can be intentional,for protection purpose, or it may not be intentional. Cascade tripping is common in sequenced circuit.