Down to dusk light lab

We did hotdog experiment where we attached a hotdog to a line cord and apply a 120 V potentional across it. The hotdog slowly cooked. Then we inserted LED into the hotdog both parallel and perpendicular to the hotdog axes. The LEDs perpendicalr to the hotdog did not light and only the parallel LED light.

Following are few Series  and parallel circuit problem we did in class using KVL and KCL

Dusk to Dawn LAB: In this lab we created a light sensitive lighting system using BJT. Below are some images of our set up and also video of light turning off and on. 

We use KVL around the outer loop of the circuit to determine the voltage Vb for photocell resistance of 5K and 20 K. Below are images of our results. 

Following is an image of measured values of Vb for photocell resistances of 5K and 20 K and calculated values.