Physics Van 3-site Navigational Menu

Physics Van Navigational Menu

Q & A: Eight volts from a twelve volt battery?

Learn more physics!

Most recent answer: 07/19/2015
Q:
Doea an automotive 12v dc system actually send 12 volts to a bulb socket? My car shows 8 volts at the socket with the switch turned on. Do I have a wiring problem or not?
- Scott Lovenbury (age 19)
Sandpoint
A:

Not good, Scott...

You may have a bad battery, or a bad voltmeter.  It's also possble you might have a short somewhere.   Did you also measure the voltage right at the battery terminals?  It should be 12 volts both with ignition switch turned off and on. 

LeeH


(published on 07/19/2015)

Follow-up on this answer.