Describe or sketch the standard circuit symbol for a light-dependent resistor (LDR).
The table below shows the truth table for a logic gate.
| Input 1 | Input 2 | Output |
|---|---|---|
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
State the name of the logic gate which has this truth table.
It is possible to connect together the two inputs of the gate in (b) to form a NOT gate.
Using two of these logic gates, design a circuit with two inputs and one output which has the truth table shown below.
| Input 1 | Input 2 | Intermediate point, X | Output |
|---|---|---|---|
| 0 | 0 | 0 | |
| 0 | 1 | 0 | |
| 1 | 0 | 0 | |
| 1 | 1 | 1 |
Describe the connections of your circuit to achieve this.
Complete the logic levels for the intermediate point, X, in the table above by listing them from top to bottom.
136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.