The timing device in an automobile\'s intermittent wiper system is based on an R

Question

The timing device in an automobile's intermittent wiper system is based on an RC circuit and utilizes a 0.500 mu F capacitor and a variable resistor. What would be the minimum value that R must be made to achieve time constants which vary from 2.00 to 15.0 s in M Ohm? Numeric: A numeric value is expected and not an expression. What would be the maximum value that R must be made to achieve time constants varying from 2.00 to 15.0 s in M Ohm? Numeric: A numeric value is expected and not an expression.

Explanation / Answer

time constant = RC

a) for 2 s :

2 = Rmin * (0.5 x 10^-6)

Rmin = 4 x 10^6 ohm

b) for 15 s

15 = Rmax * (0.5 x 10^-6)

Rmax = 30 x 10^6 ohm

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