Tuesday HMWK, today in class, Another optional assign.

HMWK due Tuesday (no school Monday):  READ p. 407-413; p. 411#1-3, p. 413#1-7.  

In addition to the optional assignments due next Wednesday, this one: Electric Power & Ohm's Law is now available, and is due Monday, the 27th.  

Today in class we presented results/findings from the lab: trends that you noticed commonly were:

As bulbs are added in series, the current decreases and the bulbs dim.

As bulbs are added in parallel, the current increases and each light added is about equal in brightness.

As voltage is increased, current increases and bulb brightness increases.

Resistance of a light bulb is higher when it's lit; the increase in temperature that makes the bulb glow also causes it to resist current.

Some specifics were also noted, such as the specific shapes and trends within trends of graphs for advanced students.  

We then tried out a ranking task activity based on Electric Force, and had to apply three concepts:  

1. Opposite charges attract, like charges repel.

2. The electric force on two charges is proportional to the square of the distance between them  (double distance, force drops by 2^2, or 4.  Quadruple distance and force drops by 4^2, or 16.)

3. The Net Force on an object is the sum of the individual forces acting on an object.

Tomorrow in class we'll finish the back side of the ranking task worksheet (and use hands-on circuits to test our ideas!) and have notes/discussion of electric power.

I got an invite I figured I'd share with you too; it's for Wednesday, 3.14...