Circuit Deactivation
Circuit Deactivation - Related Videos
09:43
Reversible Cooling-induced Deactivations to Study Cortical Contributions to Obstacle Memory in the Walking Cat
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Cited by 3 •
2017
Complex locomotion in naturalistic environments requiring careful coordination of the limbs involves regions of the parietal cortex. The following protocol describes the use of reversible cooling-induced deactivation to demonstrate the role of parietal area 5 in memory-guided obstacle avoidance in the walking cat.
01:25
Deactivation Processes: Jablonski Diagram
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2024
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
01:24
ortho–para-Directing Deactivators: Halogens
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2023
Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
09:27
RC/RL/LC Circuits
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN Capacitors (C), inductors (L), and resistors (R) are each an important circuit element with distinct behaviors. A resistor dissipates energy and obeys Ohm's law, with its voltage proportional to its current. A capacitor stores electrical energy, with its current proportional to the rate of change of its voltage, while an inductor stores magnetic energy, with its voltage...
01:17
Second-Order Circuits
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2024
Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals. Input signals typically originate from voltage or current sources, with the output often representing voltage across the capacitor and/or current through the inductor. For example, in...
FAQs
The interruption method determines how current is stopped and how the energy source is separated. Opening a switch interrupts operation, disconnecting conductors creates physical separation, and tripping a circuit breaker stops current through the breaker. Engineers select among these actions according to the equipment condition and task, while recognizing that interruption alone may not address stored electrical energy.
Discharging stored electrical energy matters because opening the circuit does not necessarily remove every electrical hazard immediately. A safe deactivation procedure may therefore include releasing remaining energy after the circuit has been interrupted. This step supports maintenance, testing, and fault diagnosis by reducing exposure to components that could otherwise remain electrically energized despite the circuit’s inactive operating state.
Locking an isolation device helps preserve the deactivated condition during maintenance or testing. It also reduces unintended operation by preventing the isolation point from being casually returned to service. Combined with circuit interruption and discharge of stored energy, locking supports a controlled work environment and makes the isolation status easier to maintain.
A basic engineering workflow starts by stopping the equipment, interrupting the circuit through a switch, conductor disconnection, or circuit breaker, and isolating it from its energy source. Where required, the isolation device is locked and stored electrical energy is discharged. Engineers then verify that the system is electrically isolated before maintenance, diagnosis, testing, or other work begins.
Verification confirms that the circuit has been isolated rather than merely switched off during normal operation. Engineers assess whether the interruption and energy-source separation have been completed, whether stored electrical energy has been addressed when required, and whether the system remains inactive. This confirmation reduces exposure to energized components before maintenance, testing, or fault diagnosis starts.
Circuit deactivation is useful whenever engineers must work on, assess, or respond to electrical equipment. Maintenance benefits from reduced exposure to energized components, while fault diagnosis and testing require a controlled electrical state. During emergency response, deactivation can help prevent unintended operation. Across these situations, verification of isolation supports safer decisions and more controlled engineering work.