Physics 1 Problem Solutions 211

# Physics 1 Problem Solutions 211 - Chapt 27 Currents and...

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Unformatted text preview: Chapt. 27 Currents and Resistance 207 027 qmult 00310 2 4 4 moderate deducto-memory: Ohm’s law and micro form 16. Ohm’s law can be derived from the microscopic Ohm’s law which assumes . a) I = V R : vector J = (1 / 2) εE 2 : constant density. b) V = IR : vector J = (1 / 2) εE 2 : constant capacitance. c) V = IR : vector J = σ vector E : constant electric field. d) V = IR : vector J = σ vector E : conductivity independent of E . e) V = IR : vector J = σ vector E : conductivity strongly dependent on E . 027 qmult 00320 1 1 4 easy math: current in toaster Extra keywords: physci KB-171-32 17. What is the current in a toaster of 12 Ω with a DC potential (or voltage) drop across it of 120 V? a) 0 A. b) 1440 A. c) 120 A. d) 10 A. e) 12 A. 027 qmult 00330 1 1 3 easy memory: semi-conductors 18. Semiconductors a) under all conditions obey Ohm’s law which makes them so useless. b) under all conditions obey Ohm’s law which makes them so useful....
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