1. Smoke testing in electronics and electrical engineering

2. References

Smoke testing in electronics and electrical engineering

In electronics and electrical engineering, the term smoke test or power on test is used to refer to the first time a circuit under development is attached to power, which will sometimes produce actual smoke if a design or wiring mistake has been made. Most often, this smoke comes from burning resistors, which produce a unique smell. For certain circuits, overheating and burning due to circuitry that is still not properly operating can be avoided by slowly turning up the input voltage to the unit under test by using a variable autotransformer and watching the electric current consumption.{{citation needed|date=November 2010}}

Overloaded integrated circuits typically produce "blue smoke" (or magic smoke). "Blue smoke" is the subject of jokes among technicians who refer to it as if it were a genie in the circuit: It's the blue smoke that makes it work——let out the blue smoke and it won't do anything.

References

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