Download EMM Lesson 7

EMM Lesson 7
Description of lesson:
During this lesson, students designed and conducted an experiment regarding maximum
force (number of washers) and how the batteries were connected (series or parallel).
Series connection: batteries are connected in a single line so that one battery’s positive
terminal connects to the negative terminal of the next battery.
 battery voltages combine to produce a larger voltage to supply energy more
rapidly to the motor
 motor will be more powerful than it would with a single battery
 if one battery is dead in connection, no current will flow through the motor
Parallel circuit: batteries are connected by the positive of one battery to the positive of
the next battery and the negative is connected to the negative terminal of the next battery.
 each battery supplies a small amount of current (less than series.
 Less current means the energy of each battery is used at a slower rate and the
battery lasts longer than in a series connection
 Motor works as if connected to only one battery but works for longer time
than if only using one battery
 If one battery runs down, the others continue to supply energy to the motor
Sample data:
Connection Type
Series 2 batteries
# of
washers
4
Series- 3 batteries
7
Parallel- 2 batteries
2
Parallel- 3 batteries
2
Reflection Questions:
1A.
1B.
1C.
1D.