#1 - You are designing a circuit to run the variable intermittent windshield wipers for a car. You need it to have a knob that runs between fast and slow. The easiest way to do this is to vary the resistance with a knob and use a capacitor to trigger the motor to operate. Which expression shows the correct time between wipes for the circuit shown? t = -RC · In (1- ) CORRECT R Vc t = RC · In (Vc – Vo) PC Vo Motor t = –RC · In () PC Vo

#1 - You are designing a circuit to run the variable intermittent windshield wipers for a car. You need it to have a knob that runs between fast and slow. The easiest way to do this is to vary the resistance with a knob and use a capacitor to trigger the motor to operate. Which expression shows the correct time between wipes for the circuit shown? t = -RC · In (1- ) CORRECT R Vc t = RC · In (Vc – Vo) PC Vo Motor t = –RC · In () PC Vo