Powering some 12V motors for a robot from a 48V tether supply.

Quite easy to get into hundreds of watts with relatively small brushless motors, the type that would normally be used in hobby RC, powered from LiPos. The Vicor parts have a good amount of protection circuitry as well, useful when shorted wires can start glowing very quickly, and RC lipo packs have no protection at all.

Switchgear testing, for HighVoltage (~110KV++) or MediumVoltage (~10KV to 110) you usually will test only the secondary side, for LowVoltage (~400V -10KV)you can test the Breaker with a primary source, these Breakers range from 100A to 5000A.

Galvanoplasty, electrolysis, and many other electricity-dependent chemical reactions, strong electromagnets and small wire-length actuators (like rail guns).