Lecture_6 - Lecture 6-1 Physics 219 Question 1 January 31,...

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Lecture 6-1 A (non-ideal) battery of emf 1.5 V and internal resistance 5 is connected to a light bulb of resistance 50 . How much power is delivered to the light bulb? a) 0.75 W b) 0.19 W c) 0.037 W d) 0.045 W e) 0.041 W Physics 219 – Question 1 – January 31, 2011
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Lecture 6-2 Capacitors • A capacitor is a device that is capable of storing electric charges and thus electric potential energy . => charging • Its purpose is to release them later in a controlled way. => discharging • Capacitors are used in vast majority of electrical and electronic devices. +Q - Q Q Q Q Typically made of two conductors and, when charged, each holds equal and opposite charges .
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Lecture 6-3 Capacitance • Capacitor plates hold charge Q The two conductors hold charge +Q and –Q , respectively. • The capacitance C of a capacitor is a measure of how much charge Q it can store for a given potential difference V between the plates. QV ∝∆ Expect Q C Let V Capacitance is an intrinsic property of the capacitor.
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This note was uploaded on 04/23/2011 for the course PHYS 219 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Lecture_6 - Lecture 6-1 Physics 219 Question 1 January 31,...

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