Plausible propulsion methods given a virtually infinite electric power source

Humanity discovered a new energy source, virtually infinite, that can produce gigawatts of electric power using devices of few kilograms.

Land and sea transport obviously will switch to electric motors without major changes, but what about air and space transport?

What are plausible propulsion methods for high speed aircraft and space launch vehicles with a very light and powerful electric energy source available?

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Plausible propulsion methods given a virtually infinite electric power source

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