1. (a) A defibrillator (a device that stores charge on a capacitor used to start the heart beat of a patient under cardiac arrest after suffering irregular heartbeats) sends a 6 A current through the chest of a patient by applying a 7500 V potential as in the figure. What is the resistance of the path (through the wire and the body)? -ai+a R= ΚΩ (b) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the path resistance. To understand the importance of using the gel, discuss the difficulties that would ensue if a larger voltage were used to produce the same current through the patient, but with the path having perhaps 50 times the resistance by finding the ratio, Pno-gel Pgel (Hint: The current must be about the same, so a higher voltage would imply greater power. Use this equation for power: P = PR.) What difficulties arise when no gel is used? O a. The voltage is too high for the human body even when the current is the same. O b. There is a risk of skin burns because of the high power deposited.

1. (a) A defibrillator (a device that stores charge on a capacitor used to start the heart beat of a patient under cardiac arrest after suffering irregular heartbeats) sends a 6 A current through the chest of a patient by applying a 7500 V potential as in the figure. What is the resistance of the path (through the wire and the body)? -ai+a R= ΚΩ (b) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the path resistance. To understand the importance of using the gel, discuss the difficulties that would ensue if a larger voltage were used to produce the same current through the patient, but with the path having perhaps 50 times the resistance by finding the ratio, Pno-gel Pgel (Hint: The current must be about the same, so a higher voltage would imply greater power. Use this equation for power: P = PR.) What difficulties arise when no gel is used? O a. The voltage is too high for the human body even when the current is the same. O b. There is a risk of skin burns because of the high power deposited.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Ohm's law

Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.

Path of Least Resistance

In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.

Question

1. (a) A defibrillator (a device that stores charge on a capacitor used to start the heart beat of a patient
under cardiac arrest after suffering irregular heartbeats) sends a 6 A current through the chest of a
patient by applying a 7500 V potential as in the figure. What is the resistance of the path (through the
wire and the body)?
-alita
R=
ΙΚΩ
(b) The defibrillator paddles make contact with the patient through a conducting gel that greatly
reduces the path resistance. To understand the importance of using the gel, discuss the difficulties
that would ensue if a larger voltage were used to produce the same current through the patient, but
with the path having perhaps 50 times the resistance by finding the ratio,
Po
no-gel
gel
(Hint: The current must be about the same, so a higher voltage would imply greater power. Use this
equation for power: P = PR.)
What difficulties arise when no gel is used?
O a. The voltage is too high for the human body even when the current is the same.
O b. There is a risk of skin burns because of the high power deposited.

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