2 r v 0 to the external load and to the internal

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ry is delivered − I 2 R + ∆V = 0 to the external load and to the internal resistance 303L: DC Circuits (Ch.28) 303L: DC Circuits (Ch.28) 1 RC circuits RC circuit RC circuits charging a capacitor discharging a capacitor contains a series combination of a resistor and a capacitor • Kirchhoff’s loop rule: • Initial current I0 = dq dt ( q (t ) = Cε 1 − e − t RC I (t ) = ε R − t RC − • Kirchhoff’s loop rule: I= R Q = Cε dq ε q =− dt R RC ⇒ ) = Q (1 − e e −t contains a series combination of a resistor and a capacitor ε • Maximum charge on C I= RC circuit q ε − − IR = 0 C q (t ) = Q e − t ) I (t ) = − Q −t e RC dq dt ⇒ q − IR = 0 C dq q =− dt RC RC RC RC - time constant 303L: DC Circuits (Ch.28) 303L: DC Circuits (Ch.28) Electrical Meters Electrical Meters Galvanometer Ammeter Main component in analog meters for measuring current and voltage A device that measures current • The • Coil of wire free to rotate on a charges through pivot in a magnetic field provided by the must pass ammeter directly series connection a permanent magnet • Coil carries a current I • Ideally, an ammeter should have zero torque resistance so that the current being causes the coil to twist ~I • Calibrated instrument can measured is not altered be used to measure I or ∆V • Small shunt resistor in parallel reduces I through a galvanometer and am...
View Full Document

This document was uploaded on 01/15/2014.

Ask a homework question - tutors are online