An implanted pacemaker supplies the heart with 72 pulses per...

An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing $6.8 \mathrm{~V}$ for $0.68 \mathrm{~ms}$. 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.

Key Concepts

Pulse Repetition Rate

The pulse repetition rate refers to the number of pulses delivered per unit time. In applications with intermittent energy delivery, knowing the repetition rate allows for the calculation of overall energy and power outputs, bridging the gap between individual pulse characteristics and average performance.

Average Power in Periodic Systems

Average power in systems that operate with periodic or pulsed inputs is obtained by dividing the total energy delivered over a full cycle by the cycle duration, or equivalently by multiplying the energy per pulse by the pulse repetition frequency. This concept is important for evaluating energy efficiency and power consumption over time.

Ohm's Law

Ohm's Law is a fundamental principle in electrical circuits stating that the current flowing through a resistor is directly proportional to the voltage across it and inversely proportional to its resistance (I = V/R). This relationship is essential for understanding how voltage and resistance determine the current in a circuit.

Electrical Energy in Resistive Circuits

The energy delivered to a resistive element can be computed by determining the instantaneous power (which is the product of the voltage and the current) and then multiplying by the time duration over which that power is applied. This concept is key in calculating the energy imparted during short bursts or pulses of electricity.

Transcript

Please give Ace some feedback