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Chapter 24: Problem 48

An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing \(6.0 \mathrm{V}\) for \(0.65 \mathrm{ms}\). The resistance of the heart muscle between the pacemaker's electrodes is \(550 \Omega\). Find (a) the current that flows during a pulse, (b) the energy delivered in one pulse, and (c) the average power supplied by the pacemaker.

Short Answer

Expert verified
The current that flows during a pulse is 0.011 A, the energy delivered in one pulse is 0.0000043 J, and the average power supplied by the pacemaker is 0.001 J/s or 1 mW.

Step by step solution

01

Calculate the Current (I)

Using Ohm's law I=V/R, with V=6.0V and R=550 Ω, calculate the electrical current (I).
02

Calculate the Energy (E)

Energy (E) can be found using the formula E= P*t, where P=I*V is the power and t=0.65ms (convert it into S) is the time.
03

Calculate the Average Power (P_average)

The average power can be calculated using the formula P_average= E/t_pulse, where t_pulse is the time of one pulse duration, i.e. 60s/72 pulse per minute (convert it into S).

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