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### Topic: How much voltage and mA do i need? (Read 3470 times)previous topic - next topic

#### Grumpy_Mike

#15
##### Oct 08, 2011, 12:14 am
Your not supposed to do it with the meter set to amps!!!
If you do you now nothing about electricity and should stick to knitting.

#### bilbo

#16
##### Oct 08, 2011, 12:16 am
Its ok to measure battery voltage in that manner, as battery voltage only varies slightly from the load drawn, and voltmeters have a very high impedance, because they can be placed in parallel with a circuit. Ammeters are meant to be placed in series with a circuit, to accurately measure current flow with minimal disruption to the circuit.
Alice asked the Chesire Cat, who was sitting in a tree, "What road do I take?"
The cat asked, "Where do you want to go?"
"I don't know," Ali

#### clankill3r

#17
##### Oct 13, 2011, 12:36 pm
Quote
Seriously - you're not supposed to read battery voltage by simply connecting the plus and the minus with the multimeter? Wow - i've been doing this for years... Gives me a good indication of how full the batteries are...

yeah i learned that from my dad, i think Grumpy_mike will hate my dad...

#### Grumpy_Mike

#18
##### Oct 13, 2011, 04:19 pm
Quote
Seriously - you're not supposed to read battery voltage by simply connecting the plus and the minus with the multimeter? Wow - i've been doing this for years... Gives me a good indication of how full the batteries are...

There is nothing wrong with measuring the battery voltage like this. However, if you take the trouble to actually read the rest of the thread the poster was measuring the CURRENT from a battery by simply connecting the plus and minus of a multimeter across the battery.

If your dad actually taught you that trick then he was presumably in the business of selling either batteries or multimeters.

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