Phys.219_Lec.06._2012.

Phys.219_Lec.06._2012. - Lecture 6-1 Physics 219 Question 1...

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Lecture 6 Lecture 6 -1 A (non-ideal) battery of emf 1.5 V and internal resistance 5 Ω is connected to a light bulb of resistance 50 Ω . 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 30. 2012.
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Lecture 6 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 Δ Q Q Δ Typically made of two conductors and, when charged, each holds equal and opposite charges . Q e -
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Lecture 6 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 Let C V Capacitance is an intrinsic property of the capacitor. [] [ ] Q Coulomb CF VV o l t == farad Potential difference = V = ε = electromotive force Ο V (volts)
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Lecture 6 Lecture 6 -4 Steps to calculate capacitance C 1. Put charges Q and -Q on the two plates, respectively.
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Phys.219_Lec.06._2012. - Lecture 6-1 Physics 219 Question 1...

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