The defibrillator uses a capacitor for both safety and energy control
reasons. A cap of (typically) 16 microfds is charged to (typically) 5000
Volts). This delivers (1/2)CV^2 = 200 Joules of energy when discharged to
the patient. Consider the dangers and control problems if a 500 Volt
supply were, instead, directly applied to the patient.
Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net http://www.velocity.net/~trebor
----- Original Message -----
From: "Tina Fanetti" <FanettT@WITCC.COM>
To: <PHYS-L@lists.nau.edu>
Sent: Wednesday, February 12, 2003 12:17 PM
Subject: Re: Batteries and Capacitors
| For almost all practical purposes, a battery can be
| thought of as a capacitor with a huuuuge capacitance
| and crummy high-frequency performance.<<<
|
| But why? We were talking about defilbilators and how thay have capac=
| itors in them. Why can't they just use a batteries in the device?
|
| Tina
|
| Tina Fanetti
| Physics Instructor
| Western Iowa Technical Community College
| 4647 Stone Ave
| Sioux City IA 51102
| 712-274-8733 ext 1429
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