Resistance and Capacitators - check my work.

  • #1
A heart pacemaker is designed to operate at 71 beats/min using a 8.5 microF capacitor in a simple RC circuit.

What value of resistance should be used if the pacemaker is to fire (capacitor discharge) when the voltage reaches 69% of maximum?

Here's what I've done (but my answer was wrong):

R= t / (C*ln[v0 / v])

with t = 1.183 beats/sec
C = 8.5 x 10-6F
v0/v = 0.69

R = -3.8 x 108 ohms

Where did I go wrong?
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,832
251
Hi vucollegeguy! :smile:
R= t / (C*ln[v0 / v])

with t = 1.183 beats/sec

I'm not an expert on capacitors :redface:

but shouldn't t be a time ? :confused:
 

Related Threads on Resistance and Capacitators - check my work.

Replies
4
Views
3K
  • Last Post
Replies
5
Views
997
Replies
2
Views
2K
  • Last Post
Replies
5
Views
4K
Replies
5
Views
1K
Replies
2
Views
899
Replies
23
Views
3K
  • Last Post
Replies
1
Views
1K
Replies
3
Views
1K
Replies
3
Views
1K
Top