1N 4007
A 1n4007 is a diode and not a transistor, the 4007 don't really represent anything, the 1n4007 is a axial lead standard recovery rectifier, working peak reverse voltage = 1000V, the forward current for this device = 1 Amp. More data about it can be find in the data sheet.
The number 4007 is "four thousand seven."
4000
4.007 in fraction= 4007/10004.007 = 4.007 * 1000/1000 = 4007/1000 in fraction
4007 years before 2017 was 1991BC, remembering that there was no year zero.
.4007 (or 0.4007) is written as: four thousand seven ten-thousandths.
4007
A: 1N400X signify a power rectifier series the last the X define the reverse voltage breakdown sustainable capability A 1N4001 is for example a 50V reverse voltage breakdown A 1N4007 is a 1000V reverse voltage breakdown
4007/1000
The Bold and the Beautiful - 1987 1-4007 was released on: USA: 18 March 2003
Usual symbol for diode is with a triangle - looking as an arrow hinged with a vertical line. Arrow head stands for anode for diode and line stands for its cathode. To give the symbol for zener diode we simply replace the vertical line by letter Z which also symbolizes the first designer 'Zener'