Using multimeter, why do we hold its red lead to -ve and black lead to +ve terminal?

  • Thread starter gikiian
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  • #1
gikiian
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What's the physics behind it?
 

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  • #2
256bits
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Color coded so you know which is which.
 
  • #3
gsal
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Consistency, polarity convention.

This way, you can compare to voltages and know whether they are both the same polarity or not, e.g., they are 100V and 150V, or 100V and -150V.
 
  • #4
Gordianus
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I think it's the other way round. We usually connect the red cable to the positive terminal and the black to the negative.
 
  • #5
davenn
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I think it's the other way round. We usually connect the red cable to the positive terminal and the black to the negative.

You beat me to it :) yes exactly. Im a bit suprised the first 2 responders didnt pick up on that one lol

Dave
 
  • #6
Redbelly98
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I think it's the other way round. We usually connect the red cable to the positive terminal and the black to the negative.
I agree. And the only reason I can think of is that you would prefer to have a positive number for the meter reading. But it really isn't necessary; if you reverse the leads you just get -1 times the reading you would have gotten.
 

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