| Answer | Crossword Clue |
|---|---|
| OIL | A must for a world power. |
| USA | World power, for short |
| USSR | Former world power, for short |
| logarithms | A quantity representing the power to which a fixed number (the base) must be raised to produce a given number |
| pulsejet | jet engine equipped with valves that continuously open to admit air, then close during combustion, giving a pulsating thrust: used to power the V-1, a German buzz bomb, in World War II |
| drams | a type of RAM that must be continuously supplied with power and periodically rewritten in order to retain data |
