[logo] Batteries and Bulbs

Simple circuits will be constructed using the following circuit components:

Part I

Construct a circuit using one battery, one bulb, and one wire. Draw a diagram of your circuit and observe the brightness of the bulb with respect to the standard flashlight provided by the instructor. Schematic diagrams are preferred!

Relative 
Brightness:
 
Circle one. 
much weaker
weaker
same
stronger
much stronger
    Circuit I
Diagram:
 


Part II

Construct at least two different circuits, each consisting of two batteries and one bulb. Here a "different" circuit is one which results in a different condition of bulb illumination; i.e. different brightness.

Draw diagrams of your circuits and observe the brightness of the bulb.

Relative 
Brightness:
 
much weaker
weaker
same
stronger
much stronger
    Circuit IIa
Diagram:
 
 
Relative 
Brightness:
 
much weaker
weaker
same
stronger
much stronger
    Circuit IIb
Diagram:
 


Part III

Construct at least two different circuits, each consisting of two batteries and two bulbs. Draw diagrams of your circuits and observe the brightness of each bulb.

Relative 
Brightness:
Bulb A
 
much weaker
weaker
same
stronger
much stronger
Relative 
Brightness:
Bulb B
 
much weaker
weaker
same
stronger
much stronger
Circuit IIIa
Diagram:
 
 
Relative 
Brightness:
Bulb A
 
much weaker
weaker
same
stronger
much stronger
Relative 
Brightness:
Bulb B
 
much weaker
weaker
same
stronger
much stronger
Circuit IIIb
Diagram:
 


Part IV

Construct a circuit with two batteries and three bulbs, as shown. Observe the brightness of each bulb.

Relative 
Brightness:
Bulb A
 
much weaker
weaker
same
stronger
much stronger
Relative 
Brightness:
Bulb B
 
much weaker
weaker
same
stronger
much stronger
Relative 
Brightness:
Bulb C
 
much weaker
weaker
same
stronger
much stronger
2 batt/3 bulbs
 
Now remove Bulb C and observe remaining bulbs. Please comment on the difference.
 
Relative 
Brightness:
Bulb A
 
much weaker
weaker
same
stronger
much stronger
Relative 
  Brightness:
Bulb B
 
much weaker
weaker
same
stronger
much stronger
    2 batt/2 bulbs


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Comments, suggestions, or requests to ghw@udel.edu.

"http://www.physics.udel.edu/~watson/scen103/98w/batt-bulb.html"
Last updated Jan. 9, 1998.
Copyright George Watson, Univ. of Delaware, 1996.