Why telephone lines use -48V not +48V? What’s the difference practically in -ve and +ve voltages?
30218
Why do PBX systems use -48 V?
134656
Fuses - Are there any voltage conversion for the break-off
22194
9V battery and resistor are connected in series - the voltage across the resistor is < 9V. Why?
13490
High Voltage Powerlines - clarification of energy loss
136416
Wire capacity - Total power or just current?
144550
Different and opposing voltage sources?
126170
Batteries in series vs parallel
69578
Is it really possible to "boost" 6 V DC to above 50 kV? Or even 400 kV?
103408
How does voltage know
36923
Which method or component is best to regulate 42 to 3.3 V?
155857
Voltage rating vs. power rating of a resistor
68228
18V from printer USB port. Is that normal?
102767
There's a difference between hot/neutral AC lines in a plug, but does it matter?
7780
How to interpret Vgs(th) min/max in a MOSFET datasheet?
88894
Why does a 12V 2A adapter measure only 0.358A on a multimeter?
59547
Short circuit = zero voltage?
156885
What, exactly, is voltage?