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First-Order Circuits

First-Order Circuits

First-order electrical circuits, which comprise resistors and a single energy storage element - either a capacitor or an inductor, are fundamental to many electronic systems. These circuits are governed by a first-order differential equation that describes the relationship between input and output signals.
One common example of a first-order circuit is the RC (resistor-capacitor) circuit. These circuits are used in relaxation oscillators such as neon lamp oscillator circuits. When voltage is...

Neural Circuits

Neural Circuits

Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...

Second-Order Circuits

Second-Order Circuits

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...

The Y-to-Y Circuit

The Y-to-Y Circuit

In a balanced four-wire wye-to-wye system, the arrangement involves wye-connected sinusoidal voltage sources and loads, connected through a neutral wire that links the neutral nodes of the source and load. The load impedance is connected across each phase of the load. The wye-connected source can be connected to the wye-connected load in four-wire and three-wire arrangements. A three-phase system is considered balanced when the load on each phase is equal, leading to uniform current flow and...

Electric Circuit Elements

Electric Circuit Elements

Circuit elements are the basic building blocks of an electric circuit. Essentially, an electric circuit is the interconnection of these elements. Within electric circuits, one can find two types of elements: passive and active. Active elements have the ability to generate energy, whereas passive elements do not. Passive elements include components like resistors, capacitors, and inductors, while active elements typically encompass generators, batteries, and operational amplifiers.
The most...

LC Circuits

LC Circuits

An LC circuit consists of an inductor and a capacitor, either in series or parallel. Consider a charged capacitor connected with an inductor in series. Before the switch is closed, all the energy of the circuit is stored in the electric field of the capacitor. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. Because of the induced emf in the inductor, the current cannot change...

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Related Experiment Video

Updated: Jun 28, 2026

Building a Simple and Versatile Illumination System for Optogenetic Experiments

Building a Simple and Versatile Illumination System for Optogenetic Experiments

Published on: January 12, 2021

Seeing circuits assemble.

Jeff W Lichtman¹, Stephen J Smith

¹Department of Molecular and Cellular Biology, Center for Brain Science, Harvard University, Cambridge, MA 02138, USA.

|November 11, 2008

Summary

This summary is machine-generated.

Recent advances allow direct in vivo observation of brain development, revealing significant cellular "unbuilding" alongside construction. Understanding these complex cellular interactions is key to future neuroscience research.

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Last Updated: Jun 28, 2026

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Published on: January 12, 2021

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Published on: August 29, 2025

Area of Science:

Developmental neurobiology
Molecular biology
Optical physics

Background:

Recent breakthroughs enable direct in vivo observation of neural circuit assembly.
Current imaging reveals substantial neural "unbuilding" occurs concurrently with brain development.

Purpose of the Study:

To highlight the dynamic cellular processes during brain development.
To emphasize the role of single-cell interactions in neural circuit formation.

Main Methods:

In vivo imaging techniques.
Molecular biology tools.
Optical physics advancements.

Main Results:

Neural circuit assembly involves significant "unbuilding" processes.
Brain development is shaped by the behaviors of constituent cells like neurons, glia, and progenitors.

Conclusions:

The developing brain is a complex "cellular society" with cooperative and competitive interactions.
Novel tools are required to monitor these cellular dynamics for a deeper understanding of neurodevelopment.