Thomas Edison Laboratories - Voice Recording

One great invention by Thomas Edison is the phonograph which records your voice and it plays it back. When speaking into the receiver the sound vibration of the voice would cause a needle to create indentations on a drum wrapped with tin foil. The first recorded message was of Thomas Edison speaking "Mary had a little lamb". He showed it to others and from that he produced other amazing things. Like inventing things that help people play music from their homes.

Emelyn

The Black Maria

The Black Maria was Thomas Edison’s movie production studio. Built in 1893, it is known as the world’s first movie production studio. Films were shot using the kinematograph, which was the most state if the art, stop-and-go, filming device of its time. The Black Maria had a huge window on its ceiling in order to let sunlight into the studio because the films in this time period required an immense amount of light in order to be filmed properly. Due to the times, only silent films were filmed, but this studio was still revolutionary in the making of the modern world's entertainment.

Fernando

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Thomas Edison constructed the first movie studio in West Orange, New Jersey. This studio or Kinetographic Theater, as it was formally called, was made out of wood, tar paper, and a roof that opened up to the sun. It was also built on a turntable to allow movement towards sunlight during the course of the day. This studio was coined the Black Maria because its eccentric appearance resembled a police wagon. The Black Maria was a venue in which many short films or motion pictures were recorded. Blacksmith Scene, Fred Ott’s Sneeze, and Sioux Ghost Dance were a few of these films. Later, in 1903, the Black Maria was torn down after Edison built a glass-enclosed rooftop studio in New York City. A replica constructed in 1954, remains in Thomas Edison’s National Historical Park.

Anette

I = I (R)

The experimental data was collected by Aneta, Anette, Ashlee, Jocelyn, Julia, Lanyse, and Mitchelle

In this lab, students measure current generated by a 1.5V battery in a simple circuit with various resistors.  The horizontal axis shows resistance [ohm] and the vertical one shows current [milli-amp]. The colorful dots represent measurements and the green line shows the theoretical line of an equation I = V / R, or, using the math notation, y = 1.5 / x. You can see that the measurements fit the theoretical line perfectly well (small error bars are not visible here).

GOOD JOB!

Kirchhoff Was Right!

- Any conclusions after today's lab exercise?

- Yes, yeah... Kirchhoff was right!

Two bulbs connected to a battery are dimmer than one on its own

  

The voltage that dropped on one bulb (Figure 1) is equally distributed between the two bulbs (Figure 2).  Also, the resistance of two bulbs in the second circuit is higher than in the first circuit build with only one bulb. Higher resistance reduces the current.