Electric Circuits Voltage Measurement. Current Measurement.

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Presentation transcript:

Electric Circuits Voltage Measurement

Current Measurement

Capacitors in Parallel

Capacitors in Series

RC CIRCUITS: Charging Time constant = τ = RC

RC Circuits: Discharging Time constant = τ = RC

The physics of heart pacemakers Heart pacemakers, for instance, incorporate RC circuits to control the timing of voltage pulses that are delivered to a malfunctioning heart to regulate its beating cycle.

P 103 In a heart pacemaker, a pulse is delivered to the heart 81 times per minute. The capacitor that controls this pulsing rate discharges through a resistance of 2.1 MΩ. One pulse is delivered every time the fully charged capacitor loses 68.0% of its original charge. What is the capacitance of the capacitor?