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19.7 Energy Stored in Capacitors Most of us have seen dramatizations in which medical personnel use a defibrillator to pass an electric current through a patient's heart to get it to beat normally. (Review Figure 19.24.) Often realistic in detail, the person applying the shock directs another person to "make it 400 joules this time." The energy delivered by the defibrillator is stored in a capacitor and can be adjusted to fit the situation. Sl units of joules are often employed. Less dramatic is the use of capacitors in microelectronics, such as certain handheld calculators, to supply energy when batteries are charged. (See Figure 19.24.) Capacitors are also used to supply energy for flash lamps on cameras. Figure 19.24 Energy stored in the large capacitor is used to preserve the memory of an electronic calculator when its batteries are charged. (credit: Kucharek, Wikimedia Commons)

19.7 Energy Stored in Capacitors Most of us have seen dramatizations in which medical personnel use a defibrillator to pass an electric current through a patient's heart to get it to beat normally. (Review Figure 19.24.) Often realistic in detail, the person applying the shock directs another person to "make it 400 joules this time." The energy delivered by the defibrillator is stored in a capacitor and can be adjusted to fit the situation. Sl units of joules are often employed. Less dramatic is the use of capacitors in microelectronics, such as certain handheld calculators, to supply energy when batteries are charged. (See Figure 19.24.) Capacitors are also used to supply energy for flash lamps on cameras. Figure 19.24 Energy stored in the large capacitor is used to preserve the memory of an electronic calculator when its batteries are charged. (credit: Kucharek, Wikimedia Commons)

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Energy Stored in Capacitors
• List some uses of capacitors.                                                                            • Express in equation form the energy stored in a capacitor.
• Explain the function of a defibrillator.

19.7 Energy Stored in Capacitors Most of us have seen dramatizations in which medical personnel use a defibrillator to pass an electric current through a patient's heart to get it to beat normally. (Review Figure 19.24.) Often realistic in detail, the person applying the shock directs another person to "make it 400 joules this time." The energy delivered by the defibrillator is stored in a capacitor and can be adjusted to fit the situation. Sl units of joules are often employed. Less dramatic is the use of capacitors in microelectronics, such as certain handheld calculators, to supply energy when batteries are charged. (See Figure 19.24.) Capacitors are also used to supply energy for flash lamps on cameras. Figure 19.24 Energy stored in the large capacitor is used to preserve the memory of an electronic calculator when its batteries are charged. (credit: Kucharek, Wikimedia Commons)
Transcribed Image Text:19.7 Energy Stored in Capacitors Most of us have seen dramatizations in which medical personnel use a defibrillator to pass an electric current through a patient's heart to get it to beat normally. (Review Figure 19.24.) Often realistic in detail, the person applying the shock directs another person to "make it 400 joules this time." The energy delivered by the defibrillator is stored in a capacitor and can be adjusted to fit the situation. Sl units of joules are often employed. Less dramatic is the use of capacitors in microelectronics, such as certain handheld calculators, to supply energy when batteries are charged. (See Figure 19.24.) Capacitors are also used to supply energy for flash lamps on cameras. Figure 19.24 Energy stored in the large capacitor is used to preserve the memory of an electronic calculator when its batteries are charged. (credit: Kucharek, Wikimedia Commons)
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