Such motors draw between 40 and 160 milliamperes
of current from the power source, which is far too demanding for the normal lithium or zinc-air batteries found in watches.
Technique factors (eg, kVp, milliamperes
[mA] and exposure time) are important in reducing exposure.
There he machine sat: a massive permanent magnet whirling within a giant copper coil large enough to fill the back of a station wagon, ostensibly receiving energy from an array of batteries providing less than 2 milliamperes
of current yet producing enough energy to light up a flickering set of fluorescent and incandescent lights.
Both silicon and GaAs PIN diodes require DC power to turn on, and the forward current is of the order of several milliamperes
. The dual-gate FET has an additional gate to provide control.
The current required by the cold cathode lamp, basically a small metal tube, is at most 4 milliamperes
, which is roughly four thousandths of the current in a 100watt incandescent bulb.
 A current of 2 milliamperes
from the positive pole of a dry cell connected to the terminals marked "dry cell main dial" enters the tap wire attached to the point 18 on the manganin wire and flows to the right or the left through the manganin wire, or back to the cell without entering the manganin wire, according to the position of the slider S.
The calibrator also measures milliamperes
and provides an accuracy of 0.05 percent of reading.
Designed to interface with a programmable logic cotroller, the relays can be controlled by 15 to 32 V at 20 milliamperes
However, the diode requires a control current on the order of milliamperes
. Due to this high power requirement, application areas are limited and the diodes are not suitable for hand-held or mobile systems.
20 is related to the radiant intensity of the beam per milliamperes
of beam current.
The current is trivial, less than 3 milliamperes
SPECIFICATIONS & MEASUREMENTS * Vixen Sphinx Weight (head only) 15.4 lb (7.0 kg) Power Requirements Voltage 12 volts DC Slewing current 2.18 amperes Tracking current 570 milliamperes
Slewing speeds Maximum 2.5[second]/second Minimum 15[second]/second Periodic error 20[second] * All values measured by Sky & Telescope.