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Once, a few of the guys made an emergency transmission repair in a hotel parking lot with the car balanced on four jack stands -- the cheap, flimsy ones -- the morning after a long drive followed by an all-night bender, surrounded by people showing off and doing burnouts. These tools tend to be expensive, though, making them most suitable for professionals and people who plan to do lots of wiring work. When you work with objects that are at the nanoscale or smaller, you begin to enter the realm of quantum mechanics. It is the result of an interaction between two objects. Consider two ice skaters standing at some distance apart. But if two resonating coils with the same frequency get within a few meters of each other, streams of energy move from the transmitting coil to the receiving coil. A mercury switch is made up of two electrical wires and a ball of mercury positioned inside a contained cylinder. One simple sensor is a long, flexible metal contact positioned just above another metal contact. As long as both coils are out of range of one another, nothing will happen, since the fields around the coils aren't strong enough to affect much around them.

On its way to the brain, the current passes through a crossover, an electrical device that only conducts electricity of a certain frequency range. A fully equipped car alarm has a device that senses this intrusion. Another way to detect breaking glass, as well as somebody opening the door, is to measure the air pressure in the car. The idea of a shock sensor is fairly simple: If somebody hits, jostles or otherwise moves your car, the sensor sends a signal to the brain indicating the intensity of the motion. The reason for this is simple: Nothing's perfect. Depending on the severity of the shock, the brain signals a warning horn beep or sounds the full-scale alarm. Based on how many bursts it receives and how long they last, the brain can determine the severity of the shock. For example, if someone is towing your car away, the mercury switches, the shock sensor and the radar sensor will all register that there is a problem. There's typically an issue with your key fob if your car alarm is sounding without being set off. This is really only an issue for rescue crews who have to deal with ruptured batteries, and they can easily handle it by properly ventilating the wreck.

They are maintenance-free (when you operate them from your car's battery -- if you build your own deep-cycle battery bank you will have to maintain the batteries). Imagine this: You're driving along, tunes blasting, without a care in the world when suddenly, the dashboard battery light flickers to life. What does it mean when your car alarm goes off while driving? But a low car battery (or worse, a dead battery) will also cause a decrease in voltage, so if your car alarm is acting up, you may want to check your battery. If it's been ruptured, a full tank of gasoline adds a great deal of danger to a rescue situation, just as a ruptured battery pack or exposed power line presents a risk. For a particular line of transmitter devices, there might be millions of different pulse codes. In different situations, all of these alarms might cover the same ground. The truck can lower to ground level and raise back up with a lifting force of 4,000 pounds (17,800 newtons). If a thief changes the angle of your car (by lifting it with a tow truck or hiking it up with a jack, for example), some of the closed switches open and some of the open switches close.

If any of the switches are thrown, the central brain knows that someone is lifting the car. In most systems, the brain will flash the lights and tap the horn when you arm and disarm your car. When this happens, the brain receives short bursts of current from all of the individual circuits. The crossover is configured so that it will only conduct current that has the frequency of breaking glass. Making a lot of noise brings attention to the car thief, and many intruders will flee the scene as soon as the alarm blares. Power inverters are used to convert direct current or DC, the power that comes from a car battery, into alternating current or AC, the kind of power supplied to your home and used by larger electronics. As it rolls on, it passes over the other contacts, closing each circuit and opening it back up, until it finally comes to a stop. As it rolls off of one of the smaller electrical contacts, it breaks the connection between that particular contact and the central contact. Quantum dots are collections of atoms that together act like one giant atom -- though by giant we're still talking the nanoscale.

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