Question

What is the use of odometers in automobiles?

Answer 1

Hint: The meter is present in motorbikes and cars. Odometer is a digital device and can be seen when the bike is on or moving, odo means nothing but a path. A speedometer is a device that measures the speed. Similarly, a voltmeter is a device that measures voltage.

Complete answer: Odometer is a digital device that measures the distance covered by an automobile. In greek, odo means path and meter. We know that is an instrument that measures. So, the odometer is composed of two words that are odo and meter.
The principle of the odometer is interconnected wheels when a car or bike moves its wheels also rotate and with each complete rotation of the wheel the car or bike covers a distance equal to the circumference of the wheel. We can clearly understand with the help of the below explanation.
Circumference = 2πR
$Distance = N \times 2πR$
R is the radius of the tire.
N is the number of times the tire completes its rotation.
So, the total distance traveled is $N \times 2\pi R$
The digital odometer uses a magnet that is fixed on the vehicle wheel and as it rotates, it produces an emf in a current loop which is fixed on the vehicle. This method counts the number of times current flows in the loop.

Additional information:
All moving vehicles are fitted with digital meters. These meters are highly used in racing cars or racing video games.

Note:
Odometer can work on any moving vehicle which moves with the help of wheels. For knowledge, we have to know the first odometer was proposed by Vitruvius around 25 BC. Students usually get confused with the speedometer and odometer because both are present in a car and bike.