As another example of the application of Lenz's law, consider a coil of wire to which a battery is suddenly connected. Suppose that the battery starts a current flowing clockwise, as viewed by the observer. This current will give rise to a magnetic field whose lines will thread the coil and circle back outside it. Thus, as the current due to the battery builds up, there is a changing magnetic flux through the coil and this must result in an induced emf in the coil. What is the direction of this induced emf? Lenz's law tells us immediately that it must be counterclockwise, so as to oppose the building up of the current. Similarly, when the current in a circuit is broken, the induced emf seeks to keep the current from dying out, and this accounts for the sparking observed when switches are opened slowly. The induced emf in a circuit whose current is changing is called the "back emf", since it always opposes the alteration in the current. It arises from change in the current's own magnetic field, an effect referred to as "self-inductance".
Were Lenz's law not true, an increase in current in a coil would result in an emf that aided the applied battery, thus increasing the current further, inducing more emf and further increases in the current, ad "infinitum". This would be an unstable situation and one in which the conservation of energy principle would be disobeyed.
This sort of reasoning may be extended to other situations in which a system in equilibrium is displaced and the principle arrived at is the following.
When a system in equilibrium is disturbed, the equilibrium is displaced in the direction which tends to undo the effects of the disturbance.
This generalization of Lenz's law is called Le Chatelier's principle.
County Donegal
Donegal is a county in Ulster, Ireland. It is north of Leitrim and east of Northern Ireland.
ABC Kids (US)
ABC Kids was an American television programming block produced by ABC Productions and distributed by Buena Vista Television Group, a subsidiary of Disney Media Networks, which aired on ABC. It broadcasted several different children’s television series. These series were all owned by Disney Media Networks, the owner of ABC Entertainment Group. Most of them were also shown on Buena Vista Television Group’s own network Disney Channel.
On September 13, 1997, "Disney's One Saturday Morning" started out as a two-hour block on the "ABC Saturday Morning" lineup, and aired some of the shows that aired on it. In 1999, it was extended to 5 hours. On September 6, 1999, a spin-off, "Disney's One Too", aired on UPN and in syndication every weekday in the morning or afternoon and Sunday morning. "One Saturday Morning"' last aired on September 7, 2002.
On September 14, 2002, Disney renamed "One Saturday Morning" to ABC Kids. The block originally contained new programs, but by the end, all of ABC Kids programs became repeats of Disney Channel originals.
"Power Rangers" was previously aired on Fox Kids until halfway through the "Wild Force" season, when "Power Rangers" moved to ABC Kids for the 2002 Fall season due to the Fox Family Channel/Saban Entertainment purchase by Disney in 2001. Starting with the episode "Unfinished Business", the remainder of the "Wild Force" season premiered on ABC Kids. During its time on both Fox Kids and ABC Kids the entire "Wild Force" season also reran later on ABC Family (in part both prior to the introduction of and during the ABC Family Action Block). The following "Ninja Storm" season also premiered on ABC Kids and then reran later on the ABC Family Action Block. The "Dino Thunder", "S.P.D.", "Mystic Force", "Operation Overdrive" and "Jungle Fury" seasons were all premiered on Jetix and then reran on ABC Kids. The "RPM" season and broadcasts of the first season of "Mighty Morphin", newly re-versioned, aired exclusively on ABC Kids.
"Power Rangers" ended its run on ABC Kids on August 28, 2010, nationwide due to Haim Saban having bought back the intellectual rights to the franchise from Disney and giving airing rights to Nickelodeon in May 2010. Airings ended slightly earlier on August 14, 2010, on West coast affiliates due to a two-week preemption caused by the 2010 Little League World Series and the E/I recovery that resulted from it. On September 4, 2010, the hour held by "Power Rangers" was returned to the local affiliates. After its completion on ABC Kids, "Power Rangers" moved to Nickelodeon. All new seasons (starting with the "Samurai" season) began to premiere on the main Nickelodeon channel on February 7, 2011. Repeats of new seasons and all previous seasons began airing on Nicktoons on February 11, 2011.
With the rise of federally-mandated E/I programming guidelines, some of the network's affiliate groups, primarily Hearst Television and Allbritton Communications, refused to carry any show that did not fulfill E/I requirements (such as "Kim Possible" or the "Power Rangers" series during their time on ABC Kids) in order to instead free up time to air locally produced programming. However, some stations time shifted these shows either to very early in the morning Saturday or to Sunday, often before local news, "Good Morning America" and/or that week's "live" portion of the ABC Kids block began.
ABC Kids was aired for the final time on August 27, 2011. After that, ABC discontinued airing animated programming, making it the first not to air animated programs since September 1992, when NBC stopped airing animated programs to make room for TNBC.
On May 24, 2011, ABC announced that it had reached a deal with broadcast syndication production company Litton Entertainment to produce original content for the Saturday morning block. The "Litton's Weekend Adventure" block launched on September 3, 2011, replacing ABC Kids.
RLC circuit
A circuit containing resistance (R), inductance (L), and capacitance (C) is called an RLC circuit. A simple circuit only has one RLC series.
With a resistance "R" present, the total electromagnetic energy "U" of the circuit (the sum of the electric energy and magnetic energy) is no longer constant. Instead, it decreases with time as energy is transferred to thermal energy in the resistance. Because of this loss of energy, the oscillations of charge, current and potential difference continuously decrease in amplitude, and the oscillations are said to be damped.
They are damped in exactly the same way as those of the damped block-spring oscillator. To analyze the oscillations of this circuit, an equation can be written for the total electromagnetic energy formula_1 in the circuit at any instant. This is because the resistance does not store electromagnetic energy.
However, this total energy decreases as energy is transferred to thermal energy.
where the minus sign indicates that formula_1 decreases. By differentiating Eq. 1 with respect to time and then substituting the result in Eq. 2, the following is obtained:
Substituting formula_6 for formula_7 and formula_8 for formula_9, the following is obtained:
Jackstones
Jackstones is a traditional Korean game. It is usually played by girls. The game is similar to the game Jacks. Jackstones is also a traditional game played in IndiaTamilnadu by the name Anchakal it is also played in rural villages of Andhra Pradesh by the name of Achenagandlu or Achamgilla or Chintapikkala aata, using small stones or Tamarind seeds.
The game is played with five stones. Each stone is about the size of an almond. Players can only use one hand to play the game. The game has five parts or "stages".
In the first stage, the player throws the stones on the ground. They pick up one stone and throw it upward. Before the stone falls onto the ground, they need to pick up another stone from the ground and then catch the one that was thrown. This is done again until there are no stones on the ground.