Electrical units.

guandi · 01-27-2004, 03:18 PM

i'm trying to buy a 240>120Vac transformer, and i have found a very small one for £20 that might suit my needs, but the only info i have about it is that it outputs 115VAC@30VA... wtf is VA?

ta

guandi · 01-27-2004, 03:21 PM

sorry, forgot to add... Would it power a 65Watt pump?

pdf27 · 01-27-2004, 03:50 PM

VA is an electrical engineering term deriving from the fact that current and voltage aren't in phase with each other for most electrical loads (hence PSUs having "power factor correction" to fix this).
The VA value is the (Peak Voltage) x (Peak Current), while the wattage is the Peak (Voltage x Current). Hence for a pure resistive load (no capacitance or inductance) 30VA = 30W. This will actually produce more like 25W for most real loads.

guandi · 01-27-2004, 04:10 PM

damn, thats no good for what i need

oh well. thanks alot pdf27! i needed that info in a hurry

guandi · 01-27-2004, 04:38 PM

i found what i was looking for! after about 3 weeks of searching i found...

Voltage Converters

i chose the 200w model, cost me $20usd, the shipping was $30usd tho

pdf27 · 01-27-2004, 05:00 PM

Thinking about it that should be (RMS) not (Peak) in all the cases there, but it doesn't actually make any difference to the answer - it's just in case someone decides to get awkward

01-27-2004, 03:18 PM	#1
guandi Cooling Savant Join Date: Dec 2003 Location: UK Posts: 174	Electrical units. i'm trying to buy a 240>120Vac transformer, and i have found a very small one for £20 that might suit my needs, but the only info i have about it is that it outputs 115VAC@30VA... wtf is VA? ta __________________ A8N-SLI Deluxe FX55@3ghz 2x TwinX1024-3200XL 2x BFG6800Ultra Audigy2 ZS + Gigaworks S750 2x120gb/4x80gb lots of water/copper/pumpy goodness.

01-27-2004, 03:21 PM	#2
guandi Cooling Savant Join Date: Dec 2003 Location: UK Posts: 174	sorry, forgot to add... Would it power a 65Watt pump? __________________ A8N-SLI Deluxe FX55@3ghz 2x TwinX1024-3200XL 2x BFG6800Ultra Audigy2 ZS + Gigaworks S750 2x120gb/4x80gb lots of water/copper/pumpy goodness.

01-27-2004, 03:50 PM	#3
pdf27 Cooling Savant Join Date: Jan 2004 Location: Horsham, UK Posts: 140	VA is an electrical engineering term deriving from the fact that current and voltage aren't in phase with each other for most electrical loads (hence PSUs having "power factor correction" to fix this). The VA value is the (Peak Voltage) x (Peak Current), while the wattage is the Peak (Voltage x Current). Hence for a pure resistive load (no capacitance or inductance) 30VA = 30W. This will actually produce more like 25W for most real loads. __________________ Member of the paramilitary wing of CAMRA

01-27-2004, 04:10 PM	#4
guandi Cooling Savant Join Date: Dec 2003 Location: UK Posts: 174	damn, thats no good for what i need oh well. thanks alot pdf27! i needed that info in a hurry __________________ A8N-SLI Deluxe FX55@3ghz 2x TwinX1024-3200XL 2x BFG6800Ultra Audigy2 ZS + Gigaworks S750 2x120gb/4x80gb lots of water/copper/pumpy goodness.

01-27-2004, 04:38 PM	#5
guandi Cooling Savant Join Date: Dec 2003 Location: UK Posts: 174	i found what i was looking for! after about 3 weeks of searching i found... Voltage Converters i chose the 200w model, cost me $20usd, the shipping was $30usd tho __________________ A8N-SLI Deluxe FX55@3ghz 2x TwinX1024-3200XL 2x BFG6800Ultra Audigy2 ZS + Gigaworks S750 2x120gb/4x80gb lots of water/copper/pumpy goodness.

01-27-2004, 05:00 PM	#6
pdf27 Cooling Savant Join Date: Jan 2004 Location: Horsham, UK Posts: 140	Thinking about it that should be (RMS) not (Peak) in all the cases there, but it doesn't actually make any difference to the answer - it's just in case someone decides to get awkward __________________ Member of the paramilitary wing of CAMRA

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