1730f_DC Revision Set 1 (worked solutions)

1730f_DC Revision Set 1 (worked solutions) - Current of...

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DaveSim@ThePhysicsCafe.com 1/12 www.ThePhysicsCafe.com Current of Electricity & DC Circuits Revision Set 1 1 A high potential is applied between the electrodes of a hydrogen discharge tube so that the gas is ionized. Electrons then move towards the positive electrode and protons towards the negative electrode. In each second, 5 x 10 18 electrons and 2 x 10 18 protons pass a cross-section of the tube. The current flowing in the discharge tube is A 0.16 A B 0.48 A C 0.80 A D 1.12 A
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DaveSim@ThePhysicsCafe.com 2/12 www.ThePhysicsCafe.com D 2 A battery is connected in series with a 2.0 Ω resistor and a switch as shown in the figure below. A voltmeter connected across the battery reads 12 V when the switch is open but 8.0 V when the switch is closed. V What is the internal resistance of the battery? A 0.67 Ω B 1.0 Ω C 1.3 Ω D 4.0 Ω B
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DaveSim@ThePhysicsCafe.com 3/12 www.ThePhysicsCafe.com 3 The diagram shows a metal filament lamp connected in series with an ammeter, battery and a variable resistor. A high resistance voltmeter is connected across the lamp. Which graph represents the variation of I , the current through the lamp, with potential difference V across it?
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This note was uploaded on 10/12/2010 for the course C 11 taught by Professor Na during the Spring '10 term at Rappahannock Community College.

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1730f_DC Revision Set 1 (worked solutions) - Current of...

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