Download presentation

Presentation is loading. Please wait.

Published byIsaac Gardner Modified over 4 years ago

1
Capacitors (17.7-17.9) Capacitors are elements used in circuits to store electric charge (and energy) and to block surges of electricity, protecting circuits

2
Capacitors: what are they? Caps typically consists of 2 conducting plates placed near each other but not touching. Sometimes they are wrapped into a cylinder like a burrito or one of those healthy wraps

3
Capacitors When placed in a circuit and voltage source, charges flow onto the plates. Q = CV = total charge on the capacitor C is called the Capacitance and its measured in Farads. C depends on the geometry of the Capacitor…C = ЄA/d where Є = a constant, A is the area of the plate, and d = distance between the plates.

4
Capacitors and Dielectrics A dielectric is a material which is placed between the plates in a capacitor. A dielectric does not allow electric charge to jump across the gap as easily as air, so higher voltages can be used. Dielectrics also increase the Capacitance of the capacitor.

5
Dielectrics (17.8) Dielectrics increase the capacitance by a factor of K. K = dielectric constant = material property C = KЄA/d MtlK Vacuum1.0 Paper3.7 Rubber6.7 Waffle9.3

6
Energy in a capacitor Caps store energy E = ½ CV 2 (V = Voltage, not velocity…duh)

7
Capacitors in circuits (19.5) Capacitors are commonly used in circuits to store energy and influence how quickly the current changes. Caps in Parallel have the same voltage and you find the total charge Q on each plate using Q = CV Caps in Series have the same charge on them.

8
Capacitors in series and parallel The rules for combining capacitors in a circuit is just the opposite as the resistor rules….. CircuitVoltageChargeCequiv ParallelSameAddsCeq=C1+C2 SeriesAddsSame I/C eq = 1/C1 + 1/C2

Similar presentations

OK

Copyright © 2009 Pearson Education, Inc. Various Capacitors Chapter 24 : Capacitance & Dielectrics. (in the book by Giancoli). Chapter 26 in our book.

Copyright © 2009 Pearson Education, Inc. Various Capacitors Chapter 24 : Capacitance & Dielectrics. (in the book by Giancoli). Chapter 26 in our book.

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google

Ppt on ibm company profile Ppt on history of england Show ppt on drainage pattern of indian rivers Ppt on ideal gas law lab Ppt on special types of chromosomes mutation Ppt on the art of war by sun A ppt on leonardo da vinci Ppt on natural resources for class 8 Memory games for kids ppt on batteries Ppt on natural resources in india