A charging RC circuit controls the intermittent windshield wipers in a car. The

Question

A charging RC circuit controls the intermittent windshield wipers in a car. The emf is 12.0 V. The wipers are triggered when the voltage across the 130

A charging RC circuit controls the intermittent windshield wipers in a car. The emf is 12.0 V. The wipers are triggered when the voltage across the 130 mu F capacitor reaches 10.0 V; then the capacitor is quickly discharged (through a much smaller resistor) and the cycle repeats. What resistance should be used in the charging circuit if the wipers are to operate once every 1.50 s?

Explanation / Answer

10/12 = e^-(1.3/RC) or ln(5/6) = -1.3/RC or -0.18 = -1.3/RC or
R = 1.3/(0.18x110) =0.065 ohm

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