Primeira lei de Kirchhoff e exercícios resolvidos!

Kirchhoff's law, or the law of nodes, allows for the simplified and didactic analysis of electrical circuits through currents and voltages in a loop. If you're taking the university entrance exam or studying physics in school, the best way to do this is to carefully complete all the exercises in the book before the test. The formula is simple, and the current in the loop can be calculated in a variety of situations. Regarding applications, they are immense. The nodes mentioned in the law are part of the concept of any existing electronic circuit. Even though this video is only an introduction to a vast subject, it is of fundamental importance for understanding electronics. Circuits with diodes or other non-linear components are not covered in this video. Among the objectives of this video, we highlight: Define what nodes are and how they appear in electrical circuits. Present the statement and proper explanation of Kirchhoff's first law. Demonstrate an application example. We cover the following topics throughout this video: Kirchhoff's laws will be used whenever it is necessary to analyze an electrical circuit, considering the voltage, current, and resistance of the elements contained in it. Kirchhoff's first law can also be called the current law or the law of nodes. A node is any point in a circuit where there is a branch; at this point, the current has more than one alternative path. The statement of the first law states that at a node, the sum of the currents is equal to zero, meaning a node does not accumulate charge. All current entering a node must exit that same node. Whenever using Kirchhoff's law to analyze a circuit, the signs of the circuit's components must be standardized. All current entering a node will be positive, and all current leaving the node will be negative. Example of application of Kirchhoff's first law. Highlights in this video: 00:30 - The foundation of this video is understanding what an electrical circuit is and how to use Kirchhoff's first law to analyze it. 00:47 - Understanding the main quantities, such as electric current, is essential for analyzing an electrical circuit. 01:07 - Circuits can be arranged so that their components are in series, parallel, or mixed when the first two forms are combined. 01:46 - A part of an electrical circuit can still be replaced by what we call a short circuit, which can be extremely damaging to the circuit. 02:02 - Derivation at points in the electrical circuit is mentioned, and derivation can be achieved by splicing electrical cables. 02:37 - In the analysis of electrical circuits, the use of Ohm's laws in conjunction with Kirchhoff's laws will be constant. 03:07 - Calculating resistance in circuits will be important for analysis and in conjunction with Kirchhoff's laws. 03:30 - Resistances can be arranged in various ways in electrical circuits, and the calculation of equivalent resistances is different for each type of arrangement. 03:52 - Understanding the multiples and submultiples of electrical quantities is essential before proceeding with the calculations. Other videos that complement this topic: What is electric current? |    • O que é corrente elétrica?   What is direct current and alternating current? |    • O que é corrente contínua e corrente alter...   #MEL_00305 -- O Mundo da Elétrica is an electricity channel with quality videos for you to learn on your phone, tablet, or on your living room TV. Electricity for everyone! Online classes, PDF manuals, electrical diagrams, and explanations! Join the World of Electricity: On YouTube (click and subscribe): http://goo.gl/vXru8M World of Electricity Website: http://www.mundodaeletrica.com.br World of Electricity Facebook:   / mundodaeletrica   World of Electricity Google Plus: https://plus.google.com/+Mundodaeletr... World of Electricity Twitter:   / mundodaeletrica