4.1. Half Adder

Try these first

1. 1.

   What are the two outputs of a Half Adder?

   Hint

   Think about what happens when you add two binary numbers.

2. 2.

   What is the value of Sum when A = 1 and B = 0?

   Hint

   Consider which logical operation corresponds to addition.

3. 3.

   The output 'Sum' in a Half Adder is obtained through which operation?

   • AND
   • OR
   • XOR

   Hint

   Remember how XOR behaves with similar and different inputs.

4. 4.

   If both inputs A and B are 1, what is the Carry output of a Half Adder?

   • True
   • False

   Hint

   Consider what a Carry represents in addition.

5. 5.

   Design a circuit using transistors that can simulate a Half Adder. Describe the logic and reasoning behind your design.

   Hint

   Think about how transistors work like switches.

6. 6.

   If you have multiple Half Adders cascaded to create a 4-bit adder, explain how they would handle carry bits between each pair.

   Hint

   Consider how binary addition carries over sum results.