Knowra Faraday cage Faraday cage A conductive enclosure that redistributes electric charge to shield its interior from external electric fields. Its effectiveness against electromagnetic radiation depends on its materials, openings, and frequency.
Electrostatic induction : The redistribution of electric charge in a material caused by a nearby electric field or charged object. External fields move free charges across the enclosure, canceling the field within its conducting material.
Faraday bag : A portable conductive enclosure designed to reduce electromagnetic communication with a device inside. It applies cage shielding to phones, keys, and other small electronics.
Electrostatic shielding : The prevention of static electric fields from reaching a protected region, commonly using a conductor. This is the cage's most direct and idealized shielding function.
Faraday cage experiment : A demonstration in which a person or object inside a conducting enclosure is protected from an external electrical discharge. It makes charge redistribution and interior shielding visible at human scale.
Gauss's law : A relation connecting electric flux through a closed surface to the charge enclosed by that surface. It formalizes why a closed conductor in electrostatic equilibrium has no electric field in its hollow interior.
Faraday room : A room whose conductive walls, floor, and ceiling limit electromagnetic fields entering or leaving it. It scales the enclosure principle to laboratories and secure testing spaces.
Electromagnetic pulse : A brief burst of electromagnetic energy that can induce voltage and current in electronic systems. A cage's protection against a pulse depends on its seams, grounding, and frequency response.
Lightning : A large electrical discharge between clouds, within a cloud, or between a cloud and the ground. A closed metal vehicle can redirect lightning current around its occupants, illustrating cage-like protection.
Skin effect : The tendency of alternating current to concentrate near the surface of a conductor as frequency increases. It helps explain how conducting walls attenuate time-varying electromagnetic fields.
Anechoic chamber : A room designed to absorb electromagnetic or acoustic reflections for controlled measurements. Radio-frequency anechoic chambers often combine absorbing surfaces with conductive shielding.
Show all 21