Story 2

Story 2

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  • I bet it's not enough voltage. Let's try adding another 1.5V battery.
  • It didn't light!
  • Why did two batteries work and one didn't?
  • It works because there's enough voltage.
  • How can we prove that it's enough?
  • Using Watt's Law we can determine the minimum voltage.
  • W= V*A
  • You mean Watts= Volts times Amperage?
  • W= V*A V=W÷A V= 2÷0.75 V= 2.67
  • Let's substitute and solve!
  • This shows that one 1.5V battery isn't enough to power the bulb...
  • W= V*A V=W÷A V= 2÷0.75 V= 2.67
  • But two 1.5v batteries are more than enough!
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