03/03/15 (Week 2)

Creating a Night Light and the Hot Dog Circuit

Here we have a hot dog circuit. The LEDs run in series with the hot dog while other LEDs run in parallel. The circuit slowing burned and cooked the hot dog.

Here is a night light using a photocell, a BJT transistor, and an LED. The photocell changes its resistance depending on the light received. With lots of light we have a low resistance and via versa. the BJT was used to step down current to the necessary value required for the LED to light up. 

 Our constructed circuit using the photocell for the LED. We will now change how much light goes into the photocell.

 As we reduce the amount of light the photocell receives we get the LED to light up.