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How many electrons are associated with a current of 15.0 A? Calculate the drift velocity of...

  1. How many electrons are associated with a current of 15.0 A?
  1. Calculate the drift velocity of electrons in a 2.053 mm diameter copper wire carrying a 20.0 A current, given there is one free electron per copper atom. (Atomic mass of copper is 63.5 kg) (Density of copper is 8.80 x 103 kg/m3)
  1. If the resistance of a copper resistor is 20.0 W at 20.0 oC, find its resistance at 100 oC.

  1. A car headlight filament is made of tungsten and has a cold resistance of 0.350 ohms. If the filament is a cylinder 4.00 cm long what is its diameter?
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