Crash Course Computer Science #5 - How Computers Calculate

What's the "real goal" of a computer?

• binary

• communication

• computation

• Twitter

What does ALU stand for?

• Arithmetic & Logic Unit

• Answers & Language Unit

• Absolute Logic Unicode

• Algebra & Logic Unicode

Why was the Intel 74181 significant?

• it was the first chip to be made in America

• it was the first time an ALU fit into a single microchip

• Intel was the first to make an ALU

• the ALU was powerful enough for a laptop

What are the two units in an ALU? (Pick 2)

• arithmetic unit

• logic unit

• language unit

• algorithm unit

What tool, previously discussed, allows for more abstraction and easier building of the arithmetic unit?

• logic gates

• boolean algebra

• binary

• transistors

What gate needs to be added to the circuit to allow for the "carrying" of the 1?

• AND gate

• OR gate

• NOT gate

A "full adder" has how many inputs?

• 1

• 2

• 3

• 4

What's an overflow?

• when the number is too large to be represented by the bits you're using

• when there's extra, unused gates in the circuit

• a mathematical error because a gate is missing from the circuit

• a circuit that is too big for the arithmetic being done

What's the highest level you can get to in Pacman before the 8-bit overflows and becomes unplayable?

• 100

• 200

• 255

• 550

What are 2 downsides to adding more "full adders" to accommodate 16- and 32-bit? (Pick 2)

• takes more time

• requires more gates

• too expensive

• can overheat