iMac: Power Supply Specifications

This article provides the power specifications for the iMac, with the exception of the iMac (Summer 2000). Refer to the the Apple Spec database online at for information on that model.
This article has been archived and is no longer updated by Apple.
These same power supply specifications are listed in the Mac OS Info Center on your computer's hard disk.

The iMac's power supply is rated to 240 volts and has auto-switch capability.

AC Line Input
  • Line voltage: 100-240 volts alternating current (V AC) wide range
  • Frequency: 50-60 Hz
  • Power: 220 volt-amperes (VA) maximum continuous

DC Power
  • Continuous output: 80 watts (W)
Output voltage Maximum current
+5 V 14.6 A (1)
+5 V (trickle) 0.1 A
+3.3 V 12.0 A (1)
+12 V 1.5 A
-12 V 0.2 A

(1) Not more than 70 W total combined power.

Power Requirements for Devices You Can Connect

Universal Serial Bus (USB)
  • Computer: 500 milliamperes (mA) per device based on USB 1.0 Specifications
  • Keyboard: 100 milliamperes (mA) per device based on USB 1.0 Specifications
  • Microphone
    Voltage: +5 V
    Current: 20 mA
    Power: 100 mW
Published Date: Feb 20, 2012