Home
»
ELECTRONICS
»
Stopwatch
PNG images: Stopwatch
A stopwatch is a handheld timepiece designed to measure the amount of time that elapses between its activation and deactivation. A large digital version of a stopwatch designed for viewing at a distance, as in a sports stadium, is called a stopclock. In manual timing, the clock is started and stopped by a person pressing a button. In fully automatic time, both starting and stopping are triggered automatically, by sensors.
The timing functions are traditionally controlled by two buttons on the case. Pressing the top button starts the timer running, and pressing the button a second time stops it, leaving the elapsed time displayed. A press of the second button then resets the stopwatch to zero. The second button is also used to record split times or lap times. When the split time button is pressed while the watch is running, the display freezes then starts then freezes again, allowing the elapsed time to that point to be read, but the watch mechanism continues running to record total elapsed time. Pressing the split button a second time allows the watch to resume display of total time.
Mechanical stopwatches are powered by a mainspring, which must be periodically wound up by turning the knurled knob at the top of the watch.
Digital electronic stopwatches are available which, due to their crystal oscillator timing element, are much more accurate than mechanical timepieces. Because they contain a microchip, they often include date and time-of-day functions as well. Some may have a connector for external sensors, allowing the stopwatch to be triggered by external events, thus measuring elapsed time far more accurately than is possible by pressing the buttons with one's finger. Stopwatches that count by 1/100 of a second are commonly mistaken[by whom?] as counting milliseconds, rather than centiseconds. The first digital timer used in organized sports was the Digitimer, developed by Cox Electronic Systems, Inc. of Salt Lake City Utah (1971). It utilized a Nixie-tube readout and provided a resolution of 1/1000 second. Its first use was in ski racing but was later used by the World University Games in Moscow, Russia, the U.S. NCAA, and in the Olympic trials.
The device is used when time periods must be measured precisely and with a minimum of complications. Laboratory experiments and sporting events like sprints are good examples.
The stopwatch function is also present as an additional function of many electronic devices such as wristwatches, cell phones, portable music players, and computers.
n most science experiments, researchers will normally use SI or the International System of Units on any of their experiments. For stopwatches, the units of time that are generally used when observing a stopwatch are minutes, seconds, and 'one hundredth of a second'.
In this clipart you can download free PNG images: Stopwatch PNG images free download
In this gallery "Stopwatch" we have 153 free PNG images with transparent background.
Stopwatch PNG images for free download:
-
Res.: 900x900
Size: 27 kb
-
Res.: 256x256
Size: 53 kb
-
Res.: 1000x1000
Size: 316 kb
-
Res.: 1466x2023
Size: 238 kb
-
Res.: 300x300
Size: 57 kb
-
Res.: 512x512
Size: 10 kb
-
Res.: 380x268
Size: 142 kb
-
Res.: 1035x1280
Size: 281 kb
-
Res.: 957x1280
Size: 436 kb
-
Res.: 1024x1280
Size: 759 kb
-
Res.: 1024x1456
Size: 3202 kb
-
Res.: 994x1280
Size: 679 kb
-
Res.: 512x512
Size: 20 kb
-
Res.: 1496x1869
Size: 61 kb
-
Res.: 1200x1200
Size: 43 kb
-
Res.: 512x512
Size: 18 kb
-
Res.: 256x256
Size: 49 kb
-
Res.: 1200x1200
Size: 43 kb
-
Res.: 200x325
Size: 25 kb
-
Res.: 1600x1600
Size: 69 kb
-
Res.: 878x980
Size: 50 kb
-
Res.: 1155x1165
Size: 207 kb
-
Res.: 256x256
Size: 11 kb
-
Res.: 564x720
Size: 182 kb
-
Res.: 577x340
Size: 166 kb
-
Res.: 577x720
Size: 80 kb
-
Res.: 536x720
Size: 90 kb
-
Res.: 588x720
Size: 192 kb
-
Res.: 512x512
Size: 17 kb
-
Res.: 464x348
Size: 118 kb
-
Res.: 512x512
Size: 48 kb
-
Res.: 579x720
Size: 112 kb
-
Res.: 1006x1280
Size: 386 kb
-
Res.: 512x512
Size: 10 kb
-
Res.: 380x363
Size: 191 kb
-
Res.: 1496x1869
Size: 798 kb
-
Res.: 1600x1600
Size: 53 kb
-
Res.: 1291x1632
Size: 1959 kb
-
Res.: 1389x1389
Size: 36 kb
-
Res.: 687x687
Size: 18 kb
-
Res.: 512x512
Size: 55 kb
-
Res.: 512x512
Size: 34 kb
-
Res.: 512x512
Size: 23 kb
-
Res.: 400x500
Size: 173 kb
-
Res.: 547x720
Size: 187 kb
-
Res.: 512x512
Size: 14 kb
-
Res.: 1135x2048
Size: 1598 kb
-
Res.: 300x300
Size: 102 kb
-
Res.: 607x700
Size: 373 kb
-
Res.: 800x1100
Size: 321 kb
-
Res.: 1200x1200
Size: 47 kb
-
Res.: 800x901
Size: 174 kb
-
Res.: 1496x1869
Size: 444 kb
-
Res.: 857x1200
Size: 1362 kb
-
Res.: 2048x2048
Size: 872 kb
-
Res.: 715x715
Size: 279 kb
-
Res.: 1794x2400
Size: 494 kb
-
-
Res.: 362x420
Size: 104 kb
-
Res.: 1000x1000
Size: 71 kb
-
Res.: 2048x2048
Size: 293 kb
-
Res.: 715x715
Size: 244 kb
-
Res.: 512x512
Size: 250 kb
-
Res.: 787x839
Size: 392 kb
-
Res.: 1150x1150
Size: 52 kb
-
Res.: 512x512
Size: 27 kb
-
Res.: 512x512
Size: 248 kb
-
Res.: 503x644
Size: 93 kb
-
Res.: 561x750
Size: 218 kb
-
Res.: 1636x3194
Size: 6675 kb
-
Res.: 1991x1912
Size: 3053 kb
-
Res.: 1114x1447
Size: 1451 kb
-
Res.: 1199x1678
Size: 2757 kb
-
Res.: 1000x791
Size: 334 kb
-
Res.: 300x300
Size: 84 kb
-
Res.: 550x899
Size: 400 kb
-
Res.: 812x980
Size: 59 kb
-
Res.: 864x980
Size: 64 kb
-
Res.: 824x980
Size: 61 kb
-
Res.: 850x980
Size: 59 kb
-
Res.: 778x980
Size: 49 kb
-
Res.: 800x980
Size: 47 kb
-
Res.: 892x980
Size: 45 kb
-
Res.: 910x980
Size: 83 kb
-
Res.: 1289x642
Size: 608 kb
-
Res.: 862x608
Size: 137 kb
-
Res.: 1940x2486
Size: 2192 kb
-
Res.: 450x540
Size: 158 kb
-
Res.: 650x650
Size: 494 kb
-
Res.: 450x540
Size: 108 kb
-
Res.: 450x540
Size: 104 kb
-
Res.: 450x540
Size: 103 kb
-
Res.: 450x540
Size: 372 kb
-
Res.: 485x600
Size: 79 kb
-
Res.: 300x300
Size: 88 kb
-
Res.: 1832x1641
Size: 3322 kb
-
Res.: 1313x1111
Size: 199 kb
-
Res.: 1941x2400
Size: 368 kb
-
Res.: 500x500
Size: 165 kb
-
Res.: 512x512
Size: 47 kb
-
Res.: 3218x3922
Size: 1922 kb
-
Res.: 1800x1800
Size: 1524 kb
-
Res.: 1134x1446
Size: 791 kb
-
-
Res.: 512x512
Size: 35 kb
-
Res.: 600x600
Size: 240 kb
-
Res.: 440x539
Size: 172 kb
-
Res.: 512x512
Size: 16 kb
-
Res.: 512x512
Size: 17 kb
-
Res.: 400x400
Size: 22 kb
-
Res.: 290x373
Size: 118 kb
-
Res.: 1093x1165
Size: 45 kb
-
Res.: 256x256
Size: 58 kb
-
Res.: 290x369
Size: 136 kb
-
Res.: 1636x3194
Size: 2061 kb
-
Res.: 1178x873
Size: 36 kb
-
Res.: 600x600
Size: 432 kb
-
Res.: 1913x1458
Size: 457 kb
-
Res.: 512x512
Size: 158 kb
-
Res.: 1991x861
Size: 640 kb
-
Res.: 1496x1869
Size: 444 kb
-
Res.: 2312x3000
Size: 1169 kb
-
Res.: 512x512
Size: 180 kb
-
Res.: 500x500
Size: 258 kb
-
Res.: 512x512
Size: 169 kb
-
Res.: 2048x2048
Size: 5228 kb
-
Res.: 429x500
Size: 44 kb
-
Res.: 447x500
Size: 55 kb
-
Res.: 1000x1000
Size: 403 kb
-
Res.: 512x512
Size: 10 kb
-
Res.: 512x512
Size: 10 kb
-
Res.: 1157x928
Size: 40 kb
-
Res.: 1000x1000
Size: 446 kb
-
Res.: 1000x1000
Size: 563 kb
-
Res.: 510x701
Size: 58 kb
-
Res.: 1313x1763
Size: 791 kb
-
Res.: 400x443
Size: 31 kb
-
Res.: 256x256
Size: 38 kb
-
Res.: 512x512
Size: 30 kb
-
Res.: 3284x4235
Size: 189 kb
-
Res.: 1280x720
Size: 36 kb
-
Res.: 500x500
Size: 979 kb
-
Res.: 1526x1008
Size: 123 kb
-
Res.: 920x697
Size: 112 kb
-
Res.: 350x350
Size: 139 kb
-
Res.: 800x852
Size: 97 kb
-
Res.: 799x592
Size: 62 kb
-
Res.: 799x983
Size: 79 kb
-
Res.: 797x845
Size: 36 kb
-
Res.: 797x845
Size: 74 kb
-
Res.: 799x919
Size: 84 kb
-
Res.: 397x550
Size: 77 kb
-
Res.: 920x1189
Size: 84 kb