A headlamp has one led takes three batteries and has a


Please help me with coming up with ideas.

1. Consider the following question: 

"A headlamp has one LED, takes three batteries, and has a switch that toggles between different circuit configurations. What circuit configuration will get the brightest light from the LED, and what configuration will provide the longest battery life? A different lamp has two LEDs, one battery, and a switch. Answer the same questions for this lamp."

Attempt to answer this question and make note of what concepts are involved. 

2. Using these questions and the concepts you've come up with, come up with an experimental question and a hypothesis. Write these down in your lab notebook. 

3. Come up with an experimental method which addresses your hypothesis. You will have the following equipment in lab:

  • 4 D batteries w/ holders 
  • 4 small light bulbs w/ holders 
  • 2 resistors, 10 ohm 
  • 2 resistors, 50 ohm 
  • 10-15 wires w/ alligator clips 
  • 1 multimeter w/ probes 
  • 2 LED's 
  • 1 switch

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Physics: A headlamp has one led takes three batteries and has a
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