Who first invented the electric light bulb?

Henri Goebbels (Heinrich? g？ Bell, aka? Henry. Goebel)1865438+April 20th 08-189365438+February 4th? Born in Lower Saxony, Germany, 1848 immigrated to new york. 1865, Henry Goebbels changed his nationality. The light bulb was invented in 1854.

The light bulb, which emits light and gives off heat through electric energy, was invented by Henry Goebbels (Edison actually found a suitable material, that is, he invented the incandescent lamp with strong practicability, and the light bulb appeared as early as 1854).

The most common function of light bulbs is lighting. With the development of society, the use of light bulbs has also undergone different changes. At first, it may be for the convenience of production and life, but with the progress of society, the use of light bulbs has also changed obviously, and functional lights with different uses such as "automobile, beautifying environment and decoration" have begun to appear.

Extended data:

major defect

1, the light bulb is black.

Although technical measures have been taken to prevent tungsten from sublimating at high temperature, in fact, tungsten can sublime at high temperature and directly change from solid to gas. The hot tungsten vapor condenses into solid crystals, which are attached to the inner surface of the lamp after cooling.

So the light bulb will turn black and dark. In addition, sublimation and the result of sublimation make the filament thinner, and the formula R=ρ (resistivity) L/S(π r? ) it can be analyzed that the radius r decreases, the filament resistance r increases, and the voltage across the lamp remains unchanged, P=U? /R, so the power of the lamp becomes smaller and the brightness becomes darker.

2. Damage to the lamp

The resistance of a conductor is related to the material, cross-sectional area, length and temperature of the conductor. The resistance of general metal materials increases with the increase of temperature, and filament tungsten also has the same properties.

When the light is turned on, the filament temperature is low, the resistance is small, and it is easy to overheat and fuse. After working for a period of time, the filament temperature rises and the resistance increases with the increase of temperature. The current and power of the lamp are close to the rated value, so it is not easy to be damaged.

A "220V, 60W" incandescent lamp is given by the formula R=U? The thermal resistance calculated by /P is 807 Ω and the measured cold resistance is 63 Ω.

Reference: Baidu Encyclopedia-Light bulb