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Revision as of 19:49, 12 November 2009
What is AC-voltage
AC-voltage is voltage where there is not a Plus and Minus terminal on the supply.
Other Names for "AC-voltage"
- Directed power or voltage
- Sine wave power or voltage
- Inverter type of power or voltage
AC-voltage safety
Voltage under the 24 volt is very unlikely to give a dangerous electric shock.
What is low voltage
Other Names for "low voltage"
- Shock free power or voltage
What is DC-voltage
DC-voltage haves a Plus and Min.
Other Names for "DC-voltage"
- DC power or voltage
- Battery type of power or voltage
- Plus-min power or voltage
Electric DC polarity PLUS and MIN
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
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 ! |
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 |
electric voltage
volt output | volt consumer | harmful for
output ? |
harmful for
power consumer ? |
---|---|---|---|
12V | 12V | no | no |
9V | 12V | no | does not work well |
3V | 12V | no | does not work |
12V | 9V | no | YES ! |
adapter with different connectors
Protect your 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 | = |
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.
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
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.
See also
external links