(a) What voltage (in kV) must be applied to uie u..:ranacitor of a heart defibrillator to store 400 J in it? kV (b) Find the amount (in C) of stored charge.
(a) What voltage (in kV) must be applied to uie u..:ranacitor of a heart defibrillator to store 400 J in it? kV (b) Find the amount (in C) of stored charge.
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Question
7-
Transcribed Image Text:EXAMPLE 19.11 CAPACITANCE IN A HEART DEFIBRILLATOR
A heart defibrillator delivers 4.00 x 10² J of energy by discharging a capacitor
initially at 1.00 x 104 V. What is its capacitance?
Strategy
We are given Ecap and V, and we are asked to find the capacitance C. Of the
three expressions in the equation for Eeap, the most convenient relationship is
CV
Ecap
19.77
Solution
Solving this expression for C and entering the given values yields
2(4.00x10° J)
(1.00x10“ V)²
2Ea
C =
can
8.00×10 ® F
19.78
8.00 µF.
Discussion
This is a fairly large, but manageable, capacitance at 1.00 x 10ª V.
Transcribed Image Text:(a) What voltage (in kV) must be applied to une v.. anacitor of a heart defibrillator to store 400 J in it?
kv
(b) Find the amount (in C) of stored charge.
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