A lot of interesting phenomena in life are explained physically .

1 Consider voltage changes on the transmission line.

At the peak of electricity consumption, the current becomes larger, the resistance on the transmission line remains the same, the current is large, and the voltage occupied becomes larger, so the user's voltage is smaller.

2.Heat, thinner, resistance increases.

According to the power p=uu r

The power becomes smaller, and the power is smaller, and it is darker.

1. There are more electrical equipment in parallel such as the power grid at the peak of electricity consumption, according to the principle of resistance parallel, we know that the resistance of the total power grid is getting smaller and smaller, so that the current is getting bigger and bigger, so the voltage lost on the transmission line = r * i is more and more, r is fixed, so the voltage to your home bulb is getting smaller and smaller, so that the light becomes darker, for example, like tap water, more and more diversion, to your home faucet, the pressure is smaller, and the water is naturally slow.

2.The brightness of the lamp has something to do with it, and the power of the lamp. For the bulb that has been used for a long time, because of the high temperature during operation, part of the tungsten filament is vaporized, so the top of the bulb will turn black after a long time, that is, the vaporized tungsten filament is cold and solidified on the inner wall of the bulb.

What phenomenon is produced after vaporization, that is, the resistance of the lamp becomes larger as the filament becomes thinner, we know that P lamp = UI = U2 i, if the voltage remains the same, the resistance of the lamp becomes larger, is the power of the lamp smaller, from 45 watts to 40 watts, the brightness naturally dims!

That's it!

The interesting physical phenomena and principles in life are as follows:1. "Sweating" from the beer bottle in the refrigerator in summer: the water vapor liquefies into small water droplets attached to the bottle when it is cold.

2. Freezing flowers on the windows in winter: water vapor condensation.

3. Wake up in the morning and see fog: the phenomenon of water vapor liquefaction in the air.

4. Clothes that are frozen in winter will dry out: the sublimation of ice.

5. The boiling point of water is different at different times and places: the difference in atmospheric pressure.

6. Water can only cook dumplings to white, while oil can fry dumplings to yellow: the boiling point of oil is higher than that of water.

7. Mirage phenomenon: light is deflected due to encountering an uneven atmosphere.

8. The small hole becomes an inverted image: the light propagates in a straight line.

9. Plane mirror can imaging: the reflection of light.

10. The chopsticks that reach into the water are bent: the light is obliquely reflected into another medium and the refraction occurs.

11. Sunlight is refracted by a prism and becomes seven colors: the dispersion of light.

12. Solar eclipse phenomenon: the linear propagation of light.

13. There is no sound on the moon: sound propagation requires a medium.

14. Convex lens can image: refraction of light.

1. When the quartz clock hanging on the wall stops moving when the battery is exhausted, its second hand often stops at the "9" position on the dial. This is due to the fact that the second hand is most hindered by the gravitational moment at this position where the "9" is located.

2. On a clear summer night, when we look up at the starry sky, we will find that the stars are constantly twinkling, because the density distribution of the atmosphere is unstable, so that the refracted rays of starlight after passing through the atmosphere change with the density of the atmosphere.

3. When taking pictures of the TV screen, the camera flash and indoor lighting should be turned off, so that the ** picture is clearer. Because the reflected light from the flash and lighting on the TV screen can interfere with the transmitted light of the TV picture.

Introduction:

Physical phenomena refer to the change of the form, size, structure, and properties (such as height, velocity, temperature, and electromagnetic properties) of matter without the formation of new matter. In other words, physical phenomena refer to physical events or physical processes that can be directly perceived, and are different from physical essences, which are abstractions of the common essential properties of similar physical phenomena.

There are black things around the light bulbs in the house

The hard-boiled egg is rotated flat on the table and will stand up at the end! (Aerodynamic shape of the eggshell).

1. Pour the syrup, water and oil into the tall glass along the tablespoon, and the liquid will be divided into three layers; Because syrup, water, and oil have different densities, the less dense always floats on top of the denser

2. Dip the two suction cups in water, face them and squeeze them together, and then pull them hard, but it is difficult to pull them apart with a lot of force; Because of the presence of atmospheric pressure

There is no single answer to this question, as long as it is reasonable