why resistace is placed in parallel to switch

what happens is resistor is placed parallel to the switch

  • effects output

    Votes: 0 0.0%
  • to prevent circuit from high current

    Votes: 0 0.0%
  • to get differnt output

    Votes: 1 100.0%

  • Total voters
    1

Thread Starter

vinay gowda

Joined Jan 10, 2017
3
Hello all,
why resistor is placed parallel to switch is there any reason related to output.
input current is 12v and this part is used in automotive application
expecting different answers
thanks in advance
 

Attachments

bushrat

Joined Nov 29, 2014
209
With switch in open position, you will only get 7.5 mA of current.. If the lightbulb is incandescent, then it's unlikely that it would light up (or maybe very dimly).
with switch closed, all power will be available to the lightbulb and it will illuminate with full brightness.
 

LesJones

Joined Jan 8, 2017
4,174
If there are more connections it could be used as a method to show that the filiment of the bulb is open circuit and give some kind of warning.

Les.
 

Thread Starter

vinay gowda

Joined Jan 10, 2017
3
yes LesJones u are right its just a switch I just shown a block diagram of the switch. it will just indicate 1 and 0 but why we need resistor there ? actually this switch is used in automotive application

thank you
 

shortbus

Joined Sep 30, 2009
10,045
Looks to me like it is an led to show the switch placement in the dash or panel. Many automotive switches do that now, so they can be found in the dark.

If this isn't the case, maybe you could tell us what the "automotive application" really is? Doing this will help you get better answers.
 

MrAl

Joined Jun 17, 2014
11,396
Hi,

If this was an inductive load it could be used to prevent or just help when the switch is opened by eating some of the back emf.

If this is a modern car then the ECU might be monitoring the bulb while the switch is off to see if the bulb is blown. There could be another circuit that shuts it all off when the key is turned off.
 
Top