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A piezoelectric speaker (also known as a piezo bender due to its mode of operation, and sometimes colloquially called a "piezo", buzzer, crystal loudspeaker or beep speaker) is a loudspeaker that uses the piezoelectric effect for generating sound. The initial mechanical motion is created by applying a voltage to a piezoelectric material, and ...
A tweeter or treble speaker is a special type of loudspeaker (usually dome, inverse dome or horn-type) that is designed to produce high audio frequencies, typically up to 100 kHz. The name is derived from the high pitched sounds made by some birds (tweets), especially in contrast to the low woofs made by many dogs , after which low-frequency ...
A fixed odds betting terminal (FOBT, sometimes pronounced "fob-tee") is a type of electronic slot machine normally found in betting shops in the United Kingdom and introduced in 1999. The terminals allow players to bet on the outcome of various games and events which have fixed odds, with the theoretical percentage return to player (RTP ...
A crystal earpiece typically consists of a piezoelectric crystal with metal electrodes attached to either side, glued to a conical plastic or metal foil diaphragm, enclosed in a plastic case. The piezoelectric material used in early crystal earphones was Rochelle salt , but modern earphones use barium titanate , or less often quartz .
A piezoelectric disk generates a voltage when deformed (change in shape is greatly exaggerated) A piezoelectric sensor is a device that uses the piezoelectric effect to measure changes in pressure, acceleration, temperature, strain, or force by converting them to an electrical charge. The prefix piezo-is Greek for 'press' or 'squeeze'. [1]
Football tournament FIFA World Cup final Founded 1930 ; 95 years ago (1930) Current champions Argentina (3rd title) Most successful team(s) Brazil (5 titles) The FIFA World Cup is an international association football competition contested by the senior men's national teams of the Fédération Internationale de Football Association (FIFA), the sport's global governing body. The championship ...
The piezoelectric properties of quartz were discovered by Jacques and Pierre Curie in 1880. The vacuum tube oscillator was invented in 1912. [ 32 ] An electrical oscillator was first used to sustain the motion of a tuning fork by the British physicist William Eccles in 1919; [ 33 ] his achievement removed much of the damping associated with ...
The FIFA Beach Soccer World Cup finals are matches which are the last of the competition, and the results determine which country's team is declared world champions. If after 36 minutes of regular play the score is a draw , an additional 3-minute period of play, called extra time , is added.