Egg timers are spring powered.
Timers, oscillators, square wave generator, power supply clocks, system clocks...you name it.
No. A chronometer measures time. Wrist watches, egg timers, and hour-glasses are chronometers.
No, traditional egg timers rely on gravity to work, as they use a mechanism that depends on the flow of sand or liquid downward to measure time accurately. In a space environment where there is no gravity, these mechanisms would not function as intended.
UPS = Uninterruptible Power Supply
power supply is a device that supplies electric power to electrical load
all about regulated power supply
Advantage of regulated power supply.
any power supply with at least 175 watts
If it is a computer power supply it is the box that gives the computer its power from the outlet.
Power amplifierPower supply regulatorSwitching power supply chopperetc.
I would use my watch, or the timer function of my microwave. Or you can start both timers at the same moment, before putting the egg in the water. When the 3-minute timer ends, put the egg in. This leaves 2 minutes on the 5-minute timer, assuming both timers are relatively accurate. When the 5-minute timer ends, re-set it again for 5 minutes, and you will have your 7 minute egg when the timer ends.
To keep the power supply cool. If there were no fan the power supply would overheat and fail.