4) A variable resistor is often used as a volume control using a circuit similar to Figure 2-19 in the Electronic text. Explain how this circuit works and state what property of a circuit made up of resistors allows the volume control to alter the loudness of the signal without altering what it sounds like.

4) A variable resistor is often used as a volume control using a circuit similar to Figure 2-19 in the Electronic text. Explain how this circuit works and state what property of a circuit made up of resistors allows the volume control to alter the loudness of the signal without altering what it sounds like.