Examlex
According to the text, whenever human activity generates a sufficient concentration of a substance in the environment to cause harm to people, it is called:
Strain Gauge
A sensor whose resistance varies with applied force; it's used in mechanical engineering to measure strain on an object.
Resistance
A measure of the opposition to the flow of electric current in a conductor, usually quantified in Ohms (Ω).
Reed Switch
An electromagnetic switch used to control the flow of electricity in a circuit, operated by an applied magnetic field.
Permanent Magnet
A material that maintains a continuous magnetic field without the need for external power.
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