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ac adapter question

K

KerriAnn

Senior member
i have an appliance here which needs 14v and .5 amps. i don't happen to have an ac adapter which is rated at 14v, but i do have a laptop adapter that says 10-20v.... what's that all about? can i use it?
(there is no switch or anything to choose the voltages between 10v and 20v....)
 
Your best bet is to get a hold of a multimeter to check what voltage that lappy adapter puts out normally. That seems like a wide voltage range to run a laptop at.
 
i thought so too.... i have a dmm, can i apply voltage directly to the probes, or do i have to put the probes in series with a circuit like when testing current?
 
Originally posted by: KerriAnn
i thought so too.... i have a dmm, can i apply voltage directly to the probes, or do i have to put the probes in series with a circuit like when testing current?
Click to expand...

If you try to do a voltage measurement with the meter's leads in series with the circuit, you'd better hope the meter is fused or otherwise protected!

You can measure the voltage of the adaptor directly with the meter's probes. Without a load though, you may get a higher reading than the normal operating voltage.

 
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