ricky1329

When will your CCFL arrival? Hunny about the end result from your headlight.

kcleung

Yes and that's what I meant by good anticipation

newbie2

Already there for few days....but AK said better install on Sat because need to wait the sealant to harden and dry. It takes few hours so weekday no good. I will go down Fri night to give the tool to AK and also Sat to install the CCFL, pls join to work it out on Sat.

Hope the result will not be too cold and too MK la.....

newbie2

Electric king, I got a stupid electric question (cos I return all my phys knowledge to teacher long time ago!)

I got an electric fan which is rated 56W, so the working current should be about 0.25A at full load (max speed), right?

Recently, I found that the fan motor is a bit hot after using for a short period of time. Then I tried to measure the current it has been drawing using a multimeter. I found that when the fan is running at the lowest speed(motor is cold and just started), the current is already 0.22A, then I turn the speed to highest, the current is about 0.45A. Oh..one more information, I measured it both with the blade putting on and also putting off but the result is similar.

Does it mean that the motor bearing is almost died so that it draws more current then normal?

Sorry guys,

pinguhk

Like to know what is the hour life span on these motors

ricky1329

I got an electric fan which is rated 56W, so the working current should be about 0.25A at full load (max speed), right? Correct!
Power = current x voltage
56 = current x 220v
current = 0.255A

I don't know why you can measure the current? Since it need to connect in series with the motor or diver parts.

Does it mean that the motor bearing is almost died so that it draws more current then normal? Refill some lubricant may help but better throw away for any doubt. They are just few hundred dollars and not worth to repair anymore.

I found the Dyson copycat at taobao just less than HK$ 200. Even can use few months still not cost too much.

http://item.taobao.com/item.htm?id=14389378901

newbie2

Thanks. Yes, I measure the current in series connection....hahaha...I know some basic knowledge gei...

Not a money issue to throw it away, just the desire to know and learn from Electric King

ricky1329

Measure AC current is dangerous . I am afraid you for any electrical shock . Take 100% care.

newbie2

Oh....really....should talk more with you tonight. Haha, I am brave on electric, I remember I disassemble the AC cassette player for investigation since 6 years old...

Is a clampmeter more safe because there is no direct contact with the current.

pinguhk

careful man