• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Question for the electrical guys about amp draw

Joined
Apr 9, 2018
Messages
309 (0.33/day)
Processor AMD Ryzen 3 3100 (Zen 3 TBA...)
Motherboard Asus B550-F Gaming Wifi
Cooling Noctua NH-U9S
Memory 32GB G.Skill Ripjaws V 3600MHz CL18
Video Card(s) Asus GTX 1060 6GB Dual
Storage 250GB Samsung 850 Evo
Case Antec Three Hundred U3
Power Supply Zalman ZM700-SV 700W Silver
I need to power a computer fan from a wall socket for my project, and have a spare AC adapter that I'm thinking of sacrificing for the cause.

Problem is, I still don't know the basics of how electrical current works.

The computer fan requires 12V DC and has a max input current of 0.08 Amps. The AC adapter can supply 12V DC and 1.5 Amps.

If I hook up the fan directly, will the fan draw only 0.08 Amps and run just fine, or will the power supply push 1.5 Amps of current into the fan and destroy it?
 
Joined
Jan 31, 2010
Messages
3,751 (0.96/day)
Location
Gougeland (NZ)
System Name Cumquat 2000
Processor AMD RyZen R7 3700X
Motherboard Asus Strix x470-F Gaming
Cooling Cryorig R1 Universal
Memory 16GB GSkill TridentZ DR4-3200 16-18-18-38 1.35V
Video Card(s) Sapphire Pulse RX5700 8GB DDR6 1750/1700
Storage 1x Adata SX8200PRO NVMe gen3 x4 1X Samsung 860 EVO 500GB 1x Sandisk 128GB PCIe, 12TB of HDD Storage
Display(s) ViewSonic VX2457 MHD 75Hz FreeSync 1920x1080p
Case SilverStone Raven RV02B-W + 3x SS AP181 + USB3.0 upgrade
Audio Device(s) Realtek S1220a + Pioneer VSX-531 amp Technics 100W Speaker set
Power Supply Enermax RevolutionXT II 750W 80+ Gold
Mouse Logitech G502 Proteus Core
Keyboard Logitech G105
Software Windows 10 X64 PRO (build 2004)
Benchmark Scores it sucks even more less now ;)
It'll do fine and only draw the current necessary to run, the 12V 1.5A rating is it's max draw it's rated for so anything from 0.0001A to 1.5A is fine to run on it
 
Joined
Apr 9, 2018
Messages
309 (0.33/day)
Processor AMD Ryzen 3 3100 (Zen 3 TBA...)
Motherboard Asus B550-F Gaming Wifi
Cooling Noctua NH-U9S
Memory 32GB G.Skill Ripjaws V 3600MHz CL18
Video Card(s) Asus GTX 1060 6GB Dual
Storage 250GB Samsung 850 Evo
Case Antec Three Hundred U3
Power Supply Zalman ZM700-SV 700W Silver
Great, thanks! Just what I need to know. So as long as the voltage is identical, then it's just making sure the amp supply is equal to or higher than required. Awesome.
 

Ahhzz

Moderator
Staff member
Joined
Feb 27, 2008
Messages
6,591 (1.43/day)
System Name Ironic
Processor Intel 2500k 4.4Ghz
Motherboard ASROCK|Z68 PROFESSIONAL Gen 3
Cooling Corsair H60
Memory 32GB GSkill Ripjaw X 1866
Video Card(s) Sapphire R9 290 Vapor-X 4Gb
Storage Samsung 860 EVO 1Tb/WD BLACK SN750 500GB NVMe
Display(s) 22" Dell Wide/ 22" Acer wide/24" Asus
Case Antec Lanboy Air Black & Blue
Audio Device(s) SB Audigy 7.1
Power Supply Corsair Enthusiast TX750
Mouse Logitech G502 Proteus Spectrum
Keyboard Corsair Vengeance K90
Software Win 7 Ult 64 bit
Great, thanks! Just what I need to know. So as long as the voltage is identical, then it's just making sure the amp supply is equal to or higher than required. Awesome.
And technically speaking, even drifting a half volt either way won't seriously cause any issues in my experience, but if you stray much farther than that, you'll break something. But yes, @Athlonite is correct: the voltage is the critical part, and as long as the current available is as much or more than required, you're good.
 
Joined
Oct 22, 2014
Messages
9,802 (4.47/day)
Location
Sunshine Coast
System Name Black Box
Processor Intel i5-9600KF
Motherboard NZXT N7 Z370 Black
Cooling Cooler Master 240 RGB AIO / Stock
Memory Thermaltake Toughram 16GB 4400MHz DDR4 or Gigabyte 16GB 3600MHz DDR4 or Adata 8GB 2133Mhz DDR4
Video Card(s) Asus Dual 1060 6GB
Storage Kingston A2000 512Gb NVME
Display(s) AOC 24" Freesync 1m.s. 75Hz
Case Corsair 450D High Air Flow.
Audio Device(s) No need.
Power Supply FSP Aurum 650W
Mouse Yes
Keyboard Of course
Software W10 Pro 64 bit
And technically speaking, even drifting a half volt either way won't seriously cause any issues in my experience, but if you stray much farther than that, you'll break something. But yes, @Athlonite is correct: the voltage is the critical part, and as long as the current available is as much or more than required, you're good.
Depends on the fan as some have a listed start up voltage as low as 7V although they are 12V fans.
 
Joined
Jan 31, 2010
Messages
3,751 (0.96/day)
Location
Gougeland (NZ)
System Name Cumquat 2000
Processor AMD RyZen R7 3700X
Motherboard Asus Strix x470-F Gaming
Cooling Cryorig R1 Universal
Memory 16GB GSkill TridentZ DR4-3200 16-18-18-38 1.35V
Video Card(s) Sapphire Pulse RX5700 8GB DDR6 1750/1700
Storage 1x Adata SX8200PRO NVMe gen3 x4 1X Samsung 860 EVO 500GB 1x Sandisk 128GB PCIe, 12TB of HDD Storage
Display(s) ViewSonic VX2457 MHD 75Hz FreeSync 1920x1080p
Case SilverStone Raven RV02B-W + 3x SS AP181 + USB3.0 upgrade
Audio Device(s) Realtek S1220a + Pioneer VSX-531 amp Technics 100W Speaker set
Power Supply Enermax RevolutionXT II 750W 80+ Gold
Mouse Logitech G502 Proteus Core
Keyboard Logitech G105
Software Windows 10 X64 PRO (build 2004)
Benchmark Scores it sucks even more less now ;)
Depends on the fan as some have a listed start up voltage as low as 7V although they are 12V fans.
doesn't really matter to the OP though he's using a 12V fan on a 12V DC wall wart so even if it had a 7V start up voltage it'd still work
 
Top