Electronic Computing

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Across
  1. 5. Computers grew into room-sized _____.
  2. 6. ENIAC could perform 5000 ten-digit additions or _____ per second.
  3. 7. It was operational for ten years, and is _____ to have done more arithmetic than the entire human race up to that point.
  4. 8. In 1904, John Ambrose Fleming developed a new electrical component called a thermionic valve, which housed two electrodes inside a(n) _____ glass bulb.
Down
  1. 1. An electronic component that permits the one-way flow of current is called a _____ .
  2. 2. In September 1947, operators on the Harvard Mark II pulled a dead moth from a _____ relay.
  3. 3. These room-sized machines were expensive to maintain and ______ to errors.
  4. 4. A(n) _____ is an electronically controlled mechanical switch.
  5. 5. Early computing devices like tabulating machines were a huge _____ to governments and business.