This is a science poster that tests if you have reached the 60-point level. Please self-test or turn out to black friends.
First, the heat radiation source
1, incandescent lamp
Principle of illumination: Have you ever played iron? Baked over the skewers? Have you burned the induction cooker? Have you used Yuba? It also glows when it is hot. Yes, the light that this buddy sends is "burned" by the current.
2, reflective incandescent bulbs
tips:
Reflective bulbs are classified into R and PAR types, R (Reflector) type is usually coated with inner wall, and PAR is fully called Parabolic Aluminised Reflector (parabolic aluminum reflector type). In addition, reflective bulbs are commonly found in AR and MR, Aluminium Reflector (Aluminum Reflector) and MulTIface Reflector (Multifaceted Reflector).
3, tungsten halogen lamp
The principle of luminescence: the tungsten halogen cycle, at a glance, no need to talk about it. You don't understand, trouble yourself to buy a tofu, thank you.
4, reflective tungsten halogen lamp
tips:
We usually see MR11, MR16, PAR20, PAR30, PAR38, PAR56, etc. The latter figures characterize the diameter of the light source in 1/8 inch units. Therefore, the diameter of the MR16 is 16*1/8=2 inches ≈51mm, so there are also manufacturers that represent the MR16 light source: QR-CBC51. Other analogies.
Second, the gas discharge lamp
1, straight tube fluorescent lamp
The principle of luminescence (as shown in the figure below): electrode (1); electrons (2) are released; into the tube, colliding with mercury atoms (3); electrons of mercury atoms (4); transition after stimulation, release Ultraviolet radiation (5); phosphor coating through the tube wall (6); ultraviolet radiation is converted to visible light (7).
tips:
Like the MR16 above, we usually say T5, T8, and T12 before. The numbers behind it are also the diameter of the tube, in 1/8 inch units. So the diameter of the T5 is almost 16mm, and the diameter of the T8 is 26mm.
2, compact fluorescent lamp
tips:
Compact fluorescent lamps are usually labeled and distinguished by the number or length of U-tubes.
None: singleU(1U)
D: double U (2U)
T:triple U(3U)
L:long U chopsticks tube
3, metal halide lamp
The principle of illuminating: The natural understanding of the understanding, do not want to understand the writing you do not understand, want to understand, go out and turn left, the mother knows.
4, high pressure sodium lamp
Third, LED
Figure: LED lighting principle (picture source network)
how about it? Did you reach 60 points?
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