Low voltage connection basics

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[edit] What is AC-voltage

AC-voltage is voltage without a Plus and Min

AC-voltage symbol

Other Names for "AC-voltage"

  • Directed power or voltage
  • Sine wave power or voltage
  • Inverter type of power or voltage

[edit] AC-voltage safety

Voltage under the 24 volt does not give dangerous electric shock.

[edit] What is low voltage

Other Names for "low voltage"

  • Shock free power or voltage

[edit] What is DC-voltage

DC-voltage haves a Plus and Min.

DC-voltage symbol

Other Names for "DC-voltage"

  • DC power or voltage
  • Battery type of power or voltage
  • Plus-min power or voltage


[edit] Electric DC polarity PLUS and MIN

Electricity basics: Marked plus wire
Electricity basics: Marked plus wire

For most kind of devices it is important to have the right voltage and polarity. Wrong voltage or polarity can destroy a device

How to Mark the plus of to find the plus pole

  • red is always plus.
  • painted line on the plus wire, no line on the min.
  • Plus wire is square, round wire is min
  • sharp edge is plus, round wire is min
  • knot is plus, no knot is min
  • mark on the plus wire and so on, the plus wire is special or not normal than a normal wire.
  • and so on, the plus wire is special or not normal than a normal wire.



These must be in good working order to save your electric material:

  • The voltage
  • The amperage
  • The PLUS and MIN position
  • The type of power AC or DC
  • The type of low voltage coax connector
  • protect your plug and connector against mechanical puling force
  • take your time to check these 6 items



Side and middle electric connection
Side and middle electric connection


sign on power output or this sign sign on power consumption or this sign harmful for output ? harmful for power consumer ?
no no
no no
no YES !
no YES !
DC AC no YES !
AC DC no YES !

[edit] electric current ampere

amp. on

power output

or this amp. amp. on

power consumer

or this amp. harmful

for output ?

harmful for

power consumer ?

500mA =0.5A 500mA =0.5A no no
400mA =0.4A 500mA =0.5A YES ! no
500mA =0.5A 400mA =0.4A no no

[edit] electric voltage

volt output volt consumer harmful for

output ?

harmful for

power consumer ?

12V 12V no no
9V 12V no does not work good
3V 12V no does not work
12V 9V no YES !

[edit] adapter with different connectors

Protect you power supply

On the left power supply output in the right power receiving device


.

Plus and min


Adapter connectors

INSIDE

mm

OUTSIDE

mm

Shortcut type plug mark
2,5 2,5 YES! 2,5 mono =
3,5 3,5 YES! 3,5 mono =
0,75 2,35 no S =
1,40 3,5 no H Nokia
1,7 4,0 no I =
1,8 4,8 no J =
2,1 5,0 no D =
1,5 5,5 no N =
2,5 5,5 no G =







[edit] What is electrical-short ?

Electrical short is when the plus and min are in contact with each other

This is harmful for the adapter or battery.

[edit] electrical-short with (dis)connecting device

Some smaller connectors shortcut the power supply if you (dis)connect .

(dis)Connect the connector to the device if there is NO power on the plug.


Right


[edit] Car cigarette lighter plug

A Car cigarette lighter plug must have the plus in the middle and the min on the outside.

Some female Car socket in some truck have 24 volt.


[edit] See Also

external links

Information on Coaxial DC Power Connectors can be found at Wikipedia.
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