cones and flaggers
A ventricular assist device (VAD) is a mechanical pump used for temporary blood circulation support.
Most temporary files will be stashed in /tmp. Though /var is often used for some temporary data as well.
Calculators, lights, and other small devices
Temporary magnets are used in various applications, such as in electronics, rubbing magnets for magnetic therapy, and in temporary holding devices for securing objects. They are particularly useful in situations where a magnet is needed temporarily and can be easily magnetized and demagnetized as needed.
Some of the best tracking devices used today are the barcode system and the WASP tracking devices. These two are the easiest and most accurate way to keep track of inventory. http://www.waspbarcode.com/inventory_control/
A buffer is a temporary storage location used to hold data during the transfer between two devices or processes. Buffers help smooth out the communication between these devices by compensating for any differences in data processing speeds.
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The correct term is "recloser" when discussing electricity. Reclosers are devices used to automatically restore power after a temporary fault on an overhead power line.
Some are video game systems and laptops and TV's.
A battery is a common temporary source of electric current. When connected to a circuit, a battery transforms stored chemical energy into electrical energy to power devices or equipment. Once the stored energy is depleted, the battery needs to be recharged or replaced to continue providing electric current.
It is not impossible. You may do some experiment. How big is the electrical devices do you mean?