Hello everybody,
I have an LED unit and I want to specify the ampere needs for 10 of those. The unit is supplied with 48VDC through a rectifier and the current it draws (measured from my multimeter) is 0.84A DC. Multiplying the former and the latter I can derive that the unit consumes 40.32W. However, I also used an energy meter wall wart style and I read from there that current drawn is 0.38A AC and power consumption is 47W.
This is where I got confused and started looking at various power supplies I have available here at home. Looking at my laptop's power supply I saw that INPUT: 100-240V, 50-60Hz, 1.5A. OUTPUT: 19V DC 4.74A.
So these are my questions:
a) Which values should I provide with to the electrician so he can work out the amp needs for 10 of those units? The DC A or the AC A readings?
b) Can you explain to me in layman's terms what is going on with the different readings or prompt me to the relevant literature?
Thank you in advance for your time
Kind Regards
I have an LED unit and I want to specify the ampere needs for 10 of those. The unit is supplied with 48VDC through a rectifier and the current it draws (measured from my multimeter) is 0.84A DC. Multiplying the former and the latter I can derive that the unit consumes 40.32W. However, I also used an energy meter wall wart style and I read from there that current drawn is 0.38A AC and power consumption is 47W.
This is where I got confused and started looking at various power supplies I have available here at home. Looking at my laptop's power supply I saw that INPUT: 100-240V, 50-60Hz, 1.5A. OUTPUT: 19V DC 4.74A.
So these are my questions:
a) Which values should I provide with to the electrician so he can work out the amp needs for 10 of those units? The DC A or the AC A readings?
b) Can you explain to me in layman's terms what is going on with the different readings or prompt me to the relevant literature?
Thank you in advance for your time
Kind Regards