a quick question about sensor?

1)What is the different between PTC and NTC thermisters?

2) what is the difference between a rheostat and a potentiometer?

Thanks i just confused on those 2 question

3 Answers

  • Favorite Answer



    A potentiometer (colloquially known as a "pot") is a three-terminal resistor with a sliding contact that forms an adjustable voltage divider.[1] If only two terminals are used (one side and the wiper), it acts as a variable resistor or rheostat. Potentiometers are commonly used to control electrical devices such as volume controls on audio equipment. Potentiometers operated by a mechanism can be used as position transducers, for example, in a joystick.

    Potentiometers are rarely used to directly control significant power (more than a watt), since the power dissipated in the potentiometer would be comparable to the power in the controlled load. Instead they are used to adjust the level of analog signals (e.g. volume controls on audio equipment), and as control inputs for electronic circuits. For example, a light dimmer uses a potentiometer to control the switching of a TRIAC and so indirectly control the brightness of lamps.

    a rheostat is so very similar to that device, i can not get any other information to pop up.

    • Login to reply the answers
  • 10 years ago

    Read and know the truth.

    1. P = positive, N = negative

    2. The rheostat is still a common and fundamental electronic component used to control the flow of current in a circuit. However, it has largely been replaced by the triac, a solid-state device also known as a silicon controlled rectifier (SCR). A triac do not waste as much power as a rheostat and has better reliability due to the absence of mechanical parts. Rheostats commonly fail because their contacts become dirty or the coil wire corrodes and breaks.

    That took all of 1 minute on Google.

    • Login to reply the answers
  • 4 years ago

    IAT, intake air temperature sensor is measuring air to determine air density to decide how much fuel to deliver. ECT engine coolant temperature, the computer is watching this for mixture control to a point and fan activity.

    • Login to reply the answers
Still have questions? Get your answers by asking now.