Introductory Electronics Unit
Messing Around:

1. Take a battery, battery clip, and buzzer. Make the buzzer buzz.

2. Reverse the buzzer. Does it still work?

3. Notice the indicators for the positive terminal on the battery and on the buzzer. The flow of charge (current) is traditionally drawn from the positive terminal to the negative terminal. The positive terminal is traditionally red and the negative terminal is black.

Q.1 Sketch your circuit, including an indication of the positive terminals on the battery and the buzzer.

4. Take a normally open (N.O.) switch and include it in your circuit. Try different ways until the switch turns the buzzer on and off.
Q.2 Sketch your circuit, including an indication of the positive terminals.

5. A circuit board makes it easy to hook up and dismantle circuits without a lot of soldering. All adjacent holes in a row are connected. All the holes in the bus (the outside strip that runs the length of the board) are also connected. See the diagram.
Everything plugged into row 1, left side, is at the same voltage. A picture of the circuit on the board without the switch is shown.
Q.3 Connect your circuit with the switch to the circuit board. Make sure it still works. Make a sketch of it.

We use circuit diagrams to simplify the sketching process. Each element has a symbol, as shown below.
Q.4 A circuit diagram for the circuit without a switch is shown. Draw a circuit diagram for your circuit with the switch.

6. Replace your N.O. switch with a normally closed (N.C.) switch.

Q.5 What happens?

Q.6 Draw a circuit diagram for the resulting circuit.


Answer and hand in Q.1-Q.6

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