19.5 Capacitors and Dielectrics A capacitor is a device used to store electric charge. Capacitors have applications ranging from filtering static out of radio reception to energy storage in heart defibrillators. Typically, commercial capacitors have two conducting parts close to one another, but not touching, such as those in Figure 19.13. (Most of the time an insulator is used between the two plates to provide separation-see the discussion on dielectrics below.) When battery terminals are connected to an initially uncharged capacitor, equal amounts of positive and negative charge. +Q and -Q. are separated into its two plates. The capacitor remains neutral overall, but we refer to it as storing a charge Q in this circumstance. Capacitor A capacitor is a device used to store electric charge. (a) Insulator (b) Figure 19.13 Both capacitors shown here were initially uncharged before being connected to a battery. They now have separated charges of +0 and -Q on their two halves. (a) A parallel plate capacitor. (b) A rolled capacitor with an insulating material between its two conducting sheets.
19.5 Capacitors and Dielectrics A capacitor is a device used to store electric charge. Capacitors have applications ranging from filtering static out of radio reception to energy storage in heart defibrillators. Typically, commercial capacitors have two conducting parts close to one another, but not touching, such as those in Figure 19.13. (Most of the time an insulator is used between the two plates to provide separation-see the discussion on dielectrics below.) When battery terminals are connected to an initially uncharged capacitor, equal amounts of positive and negative charge. +Q and -Q. are separated into its two plates. The capacitor remains neutral overall, but we refer to it as storing a charge Q in this circumstance. Capacitor A capacitor is a device used to store electric charge. (a) Insulator (b) Figure 19.13 Both capacitors shown here were initially uncharged before being connected to a battery. They now have separated charges of +0 and -Q on their two halves. (a) A parallel plate capacitor. (b) A rolled capacitor with an insulating material between its two conducting sheets.
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Capacitors and Dielectrics
• Describe the action of a capacitor and define capacitance.
• Explain parallel plate capacitors and their capacitances.
• Discuss the process of increasing the capacitance of a dielectric.
• Determine capacitance given charge and voltage.
Transcribed Image Text:19.5 Capacitors and Dielectrics
A capacitor is a device used to store electric charge. Capacitors have applications ranging from filtering static out of radio
reception to energy storage in heart defibrillators. Typically, commercial capacitors have two conducting parts close to one
another, but not touching, such as those in Figure 19.13. (Most of the time an insulator is used between the two plates to provide
separation-see the discussion on dielectrics below.) When battery terminals are connected to an initially uncharged capacitor,
equal amounts of positive and negative charge. +Q and -Q. are separated into its two plates. The capacitor remains neutral
overall, but we refer to it as storing a charge Q in this circumstance.
Capacitor
A capacitor is a device used to store electric charge.
(a)
Insulator
(b)
Figure 19.13 Both capacitors shown here were initially uncharged before being connected to a battery. They now have separated charges of +0
and -Q on their two halves. (a) A parallel plate capacitor. (b) A rolled capacitor with an insulating material between its two conducting sheets.
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