Hi there,
I'm looking to power some LEDs via mains and have come across this guide: this guide to hooking them up.
In the circuit a resistor is required, however the author mentions it as a
The thing is he does it a couple of times throughout the para, so I thought I might be missing something...
He also says he gets the value by
This is the whole section:
Thanks for clarifying this for me![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I'm looking to power some LEDs via mains and have come across this guide: this guide to hooking them up.
In the circuit a resistor is required, however the author mentions it as a
I've never heard of resistors being measured in "W" before, could it be that he means to use ohms or kohms?...220W, ¼-watt resistor
The thing is he does it a couple of times throughout the para, so I thought I might be missing something...
He also says he gets the value by
...using the R=P/I² i.e. 0.25W/(33mA)² = 229W (closest available is 220W)
This is the whole section:
"The 220W, ¼-watt resistor serves three purposes. The first is to act as a fuse should the capacitor fail. The second is to cater for harmonics and other imperfections of the mains waveform that are prevalent on modern-day mains supplies. The third to to buffer the LED against transients and the like. The value is chosen using the R=P/I² i.e. 0.25W/(33mA)² = 229W (closest available is 220W)"
Thanks for clarifying this for me