lect5410

# lect5410 - 1. When you stack three flashlight batteries in...

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1. When you stack three flashlight batteries in the same direction, you get a voltage of 3x1 ½ volts = 4 ½ volts. What voltage do you get if one of the batteries is turned to face in the opposite direction? 2. What is the difference between a bulb burning out and removing the bulb from its socket? 3. If the resistance connected to a battery is cut in half, what happens to the current through the battery?

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DC Circuits
Resistors in Series

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Resistors in Parallel
Electric Power

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R V R I IV P 2 2 = = =
Conceptual Example: Series or Parallel? The lightbulbs below are identical and have identical resistance R. Which configuration produces more light?

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Example: Electric Heater An electric heater draws 15.0 A on a 120-V line. How much power does it use and how much does it cost per month (30 days) if it operates 3.0 h per day and the electric company charges 10.5 cents per kWh? (For simplicity, assume current flowing in one direction).
Lightning Bolt Typical lightning bolt can transfer 10 9 J of energy across a

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## This note was uploaded on 05/05/2009 for the course PHYSICS 1002 taught by Professor Borovitskaya,elena during the Spring '09 term at Temple.

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lect5410 - 1. When you stack three flashlight batteries in...

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