# prob5 - APSC112 Problem Set 5 Electric Current and Circuits...

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APSC112 Problem Set 5: Electric Current and Circuits 1. The electron gun in an oscilloscope accelerates electrons through 18 kV and produces a beam of 0.30 μ A. The gun can be considered to be a battery with emf of 18 kV. The beam travels to the fluorescent screen and produces a circular spot of light 1 mm diameter. The screen is conducting and returns the electrons back to the gun, thus completing the circuit. (a) Which way does the (conventional) current flow in the circuit? (b) What is the power delivered to the electron beam by the gun? (c) what is the total charge incident on the screen in a time t starting from some arbitrary zero of time? (c) How many electrons hit the screen in 5 minutes? (d) What is the number of electrons per unit volume in the beam just before it hits the screen? [3 × 10 10 m - 3 ] 2. A light bulb has a tungsten filament. When operating at its designed tem- perature of 1800 C it absorbs 200 W from a 120 V source.

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• Fall '10
• ProfessorSomi
• Resistor, internal resistance

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