Could someone help me explain what's happening below in 1b & 2b - my existing knowledge can't articulate this.
1) I put a +5.1V lead from my power supply into a small sample of pool water in a cup.
1b) My multimeter reads +5.6V when submerged in the sample but +5.1V if the MM & supply leads make contact.
2) I place the anode of an LED in the same sample. The LED lights up.
2b) MM submerged in the sample now reads +4.9V .
Shared ground for power supply/MM/LED. Specifically, why wouldn't the MM show 5.1V in 1b & the same value in 2b?
Thanks in advance!
1) I put a +5.1V lead from my power supply into a small sample of pool water in a cup.
1b) My multimeter reads +5.6V when submerged in the sample but +5.1V if the MM & supply leads make contact.
2) I place the anode of an LED in the same sample. The LED lights up.
2b) MM submerged in the sample now reads +4.9V .
Shared ground for power supply/MM/LED. Specifically, why wouldn't the MM show 5.1V in 1b & the same value in 2b?
Thanks in advance!