Note-taking

How does a camera work?

- The cameras shutter (the thing at the front of the camera that goes ca-ching),

What is the history of the camera?


 * Phones**

1.How does a phone work? - When you talk into a phone the sound of your voice gets changed into a vibrating (shaking) electrical current. - This is then changed back into sound waves

2. What is the evolution of the phone?


 * TV**

1. How does a TV work? - TV's use radio signals and changes them into moving pictures and sounds. -

2. What is the evolution of the TV?