a *blank* is a tool that measure speed in an vehicle.
speedometer
The tool that measures speed in a vehicle is called a speedometer. The speedometer provides a real-time display of the vehicle's speed. It is typically located on the dashboard, within the driver's field of vision, to ensure easy monitoring of the vehicle's velocity.
To understand how a speedometer works, we can break it down into three main components: the speed sensor, the speedometer gauge, and the needle.
1. Speed Sensor: The speed sensor is usually located in the transmission or connected to the vehicle's wheel hub. Its purpose is to measure the rotation speed of the wheels or the driveshaft. The sensor generates an electrical signal that is proportional to the speed of rotation.
2. Speedometer Gauge: The gauge part of the speedometer is responsible for converting the electrical signal from the speed sensor into a visual measurement. In older vehicles, this was done mechanically using a system of gears and cables. However, in most modern vehicles, the gauge is electronic, with the signal being sent directly to the instrument cluster.
3. Needle: The needle is the visible part of the speedometer that indicates the current speed. It moves according to the electrical signal received from the speed sensor. The position of the needle on the speedometer gauge corresponds to the vehicle's speed.
It's important to note that the accuracy of a speedometer can be affected by factors such as tire size, tire pressure, and gear ratio. Therefore, periodic calibration and maintenance are essential to ensure accurate speed readings.