Electricity problem.Pleae help

  • Thread starter Thread starter jmandas
  • Start date Start date
  • Tags Tags
    Electricity
AI Thread Summary
The discussion centers on determining the minimum voltage that could induce ventricular fibrillation when a person touches an electric appliance while bathing, given a body resistance of 3097 Ohm. Participants express uncertainty about the current that would flow in this scenario, which is crucial for applying the formula V=IR. There is mention of a threshold current of approximately 0.7A that the human heart can tolerate before experiencing fibrillation. The conversation highlights the need for understanding both electrical and biological factors to accurately assess the risk. Overall, the thread seeks clarity on the relationship between voltage, current, and the potential for electrical hazards.
jmandas
Messages
10
Reaction score
0
Electricity problem.Pleae help!

Suppose a person touches the case of an electric appliance while taking a bath. The total resistance through the person's hand and body is 3097 Ohm. What is the smallest voltage on the case of the appliance that could cause ventircular fibrillation? Any help would be great!

I've been trying to use V=IR but what is the current? Please help!
 
Physics news on Phys.org
jmandas said:
Suppose a person touches the case of an electric appliance while taking a bath. The total resistance through the person's hand and body is 3097 Ohm. What is the smallest voltage on the case of the appliance that could cause ventircular fibrillation? Any help would be great!

I've been trying to use V=IR but what is the current? Please help!

Probably very few people here, if any, know the biological aspects of this problem. If you asked us how much current would flow for any given voltage, you could get an answer. What does it take to cause ventircular fibrillation? I assume the source of the question covers that topic somewhere.
 
I've heard 0.7A is the most the heart can take.
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top