The pull-up resistor assures the proper high voltage reading by connecting the voltage sense circuit to an electrical potential that can be removed when the switch is closed.

Question

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A pull-up resistor assures that the voltage sense circuit is connected to a known voltage level when the switch is open, and this voltage level is removed when the switch is closed, allowing the voltage sense circuit to properly sense the change in voltage.

The Pull-Up Resistor Assures the Proper High Voltage Reading by Connecting