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Worksheet: OR Gates


The diagram shows the circuit symbols for four logic gates. Which symbol represents an OR gate?

  • A(b)
  • B(a)
  • C(c)
  • D(d)


The diagram shows an OR gate. If input A is 0 and the output is 0, what must input B be?


OR Gate
Input A Input B Output
0 0 0
0 1 𝑝
1 0 1
1 1 π‘ž

The truth table shows the output of an OR gate for various combinations of inputs.

What is the value of 𝑝 in the table?

What is the value of π‘ž in the table?


A logic circuit has 4 inputs, each of which can have a value of either 0 or 1. How many rows would you have to add to a truth table in order to show all of the different possible combinations of these inputs?


The diagram shows an OR gate. If input A is 1 and input B is 0, what will the output be?


The diagram shows two OR gates, where the output of the first OR gate is one of the inputs to the second. If input A is 0, input B is 0, and input C is 1, what is the output?