Question

An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing 6.0 V for 0.65 ms. The resistance of the heart muscle between the pacemaker’s electrodes is 550 Ω. 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.

Answer 1

a) Current = 11 mA

b) Energy = 66 mJ

c) Power = 101.54 W

Step-by-step explanation:

a) Voltage, V = IR

Voltage, V = 6 V, Resistance, R = 550 Ω

Current, I
`=(6)/(550)=0.011A=11mA`

b) Energy = Current x Voltage = 6 x 0.011 = 0.066 J = 66 mJ

c)
`\texttt{Power=}(Energy)/(Time)=(0.066)/(0.65* 10^(-3))=101.54W`