Concept explainers
A simple lie detector consists of an electric circuit, one part of which is part of your body. A sensitive meter shows the current that flows when a small voltage is applied. How does this technique indicate that a person is lying? (And when does this technique not indicate when someone is lying?)
To Explain: The working of a simple lie detector.
Explanation of Solution
Introduction:
Current flows when voltage is established across a conductor. Current also depends on the resistance of the wire.
A simple lie detector works on Ohm’s law. One of ends of the circuit is connected to the finger. As per natural human tendency, a person who lies is nervous and perspires which reduces the skin’s resistance. Because of reduction in resistance, more current flows through the circuit and the detector indicates that person is lying. If there is no such change, the detector indicates that person is telling the truth.
Chapter 34 Solutions
Conceptual Physics: The High School Physics Program
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