MLA Citation: Bloomfield, Louis A. "Question 714"
How Everything Works 19 Apr 2018. 19 Apr 2018 <http://howeverythingworks.org/print1.php?QNum=714>.
714. Is there a touch sensor that can sense when you touch the body of a car? - AW
The same touch sensors that are used in "touch" lamps or some elevator buttons could be used to sense when you touch a car. A car is essentially insulated from the ground by its rubber wheels, so that when you touch it there is a tendency for electric charge to be transferred between the earth and the car through you. That's why you may receive a shock when you touch a car on a cold winter day. Many electronic devices are capable of detecting this charge transfer (in fact, many of them would be damaged by such sudden and large charge transfers). So building a car touch sensor would be easy. Whether there is a commercial product that does this is another matter, and I am not sure of the answer.

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