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Physics 2 Week 6

by: Aubrey Kenderdine

Physics 2 Week 6 PHYS 1155

Aubrey Kenderdine
Northeastern University

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About this Document

Lecture Notes, pre-ILS, and ILS notes
Physics for Engineering 2
Latika Menon
Class Notes
MCAT Physics, Physics, Engineering, Bionengineering, Charge, Ohms Law
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This 5 page Class Notes was uploaded by Aubrey Kenderdine on Saturday October 15, 2016. The Class Notes belongs to PHYS 1155 at Northeastern University taught by Latika Menon in Fall 2016. Since its upload, it has received 8 views. For similar materials see Physics for Engineering 2 in Physics at Northeastern University.

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Date Created: 10/15/16
Physics 2 for Engineering Week 6 (Oct 9-15) Current = charge flow per unit time I = dQ / dt = nqAv d Where n = # of particles per unit volume; v = ddift velocity; q = charge/particle Current is a scalar quantity in C/s or Amperes Electric field means moving charges J = current density (scalar) J = I / A = nqv d Resistivity ρ = E / J ρ (T) = ρ [1 + α (T-T )] 0 0 Where ρ i0 the resistivity at reference temperature T 0 Where α is the temperature coefficient of resistivity, unit in 1 / degrees Celsius R = ρL / A = V / I R is in ohms, one ohm = 1 V / A Ohm’s Law V = IR Only for Ohmic material Electromotive Force Ɛ – Ir = V ab Where V isaberminal volt; r is internal resistance of battery, and Ɛ is max volt Potential changes around the circuit (drop of charge) Ideal ammeter has zero resistance


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