Eddy Current Speedometers
The driveshaft has a little magnet attached to it, positioned near a magnetic sensor. Every time the driveshaft spins past the sensor, it creates a small pulse of electric current in the sensor. A simple computer counts the number of pulses per second and uses that to determine how fast the car is going. The metal Mug is attached to a spring and to the dial which shows the quickness of the machine.
Showing the Speed
As the wheels spin, they turn the cable, which makes the magnetite spin inside the Mug. This creates a Stirring Attractive sphere that flows down the Mug. The Attractive sphere produces an electric current in the Mug, which creates its own Attractive environment. The magnetic field in the cup is always slightly behind the field in the magnet, so it tries to turn the cup to catch up. The faster the wheels go, the more the magnetic field pulls on the cup. The spring stops the cup from spinning, but does allow it to rotate a bit. As the car goes faster, the cup rotates further. This pulls the needle to the right, showing the speed the car is going at on the speedometer dial.
Digital Speedometers
On most cars today, mechanical speedometers have been replaced by digital ones. With digital speedometers, the sensor is right on the car's driveshaft.Eddy now speedometers were attractive all the more public until the 1980s, and are even used on most motorcycles. An eddy now speedometer uses a far-reaching, Supple wire cable that runs from the wheels to ethical at the end the speedometer exposition dial. The speedometer is attached to a solenoid, which rotates inside a metal Mug however doesn't de facto touch it. It sends that information to the instrument dial, which displays the car's speed.
