This instruction is used to build a simple circuit. It will be helpful for the beginners of learning circuits. If you want to keep studying Electrical Engineering, you will need to build lots of complex circuit later. This circuit that I am going to teach you is the most basic one. However, I think starting from the easiest one is the best choice for every beginners. Before building this circuit, I suggest that you need to understand parallel connection, series connection of circuit. You will only need ten minutes to complete this circuit if you follow my instruction step by step. I believe every students can build this simple circuit successfully.

Preparation:

a circuit board, resistors, wires, a power supply, a multimeter.

## Step 1: Design a Circuit.

1. Draw the circuit diagram which we are going to build on a paper.

2. Write down the values we choose for each component.

3. Calculate the value of voltage across each component.

## Step 2: Find Out Components.

1. Get a resistor color code table online or from tool box.

2. Find out the resistor we want from the tool box by following the resistor color code table. For this circuit, we need two10k resistors and one 22k resistor. Hence, the colors we are going to find out are brown, black, orange and red, red, orange.

## Step 3: Connect Each Component.

1. Insert the two side of the 22k resistor into two holes on a circuit board. The two side of the resistor should be inserted into the middle ten holes of the circuit board and cannot be connected into a same line. All the lines are labeled on the figure.

2. Insert one side of these two 10k resistor into a same line with one side of the 22k resistor because these two 10k resistors are series connected with the 22k resistor.

3. Insert the other side of these 10k resistor into a same line because these two 10k resistors are parallel connected with each other.

Reminder: The two "legs" of resistor should be inserted into the small hole deeply, otherwise it will be a open-circuit.

## Step 4: Supply Power for the Circuit.

1. Get two wires from a laboratory.

2. Plug in one side of these two wires into a power supply. For this case, we need to use the 25V output port.

3. Connect another side of the wire which is from anode into the same line with the front end of the 22k resistor.

4. Connect another side of the wire which is from cathode into the same line with the back end of the 10k resistor.

5. Push "power" button to turn on the power supply.

6. Push "output on/off" to turn on the output.

7. Push "+25V" button to display the voltage of output which we are using on the screen.

8. Adjust the value on the screen to 20V.

Warning: Make sure the power supply is off when we are not using it or we have not check our circuit. There is an “output on/off” button on the power supply. This is used to control the output.

## Step 5: Verify Our Circuit.

1. Plug in one side of two wires into a multimeter. The wire should be plugged in to the port which is used to measure voltage, just like the figure.

2. Parallel connect another side of the two wires with each resistor consecutively.

3. Turn on the multimeter and press the DCV button. We are using DC voltage mode as our power supply, so we need to use DCV mode to measure the voltage across each component.

4. Read the measurement to verify our circuit. The voltages we got from this circuit are exactly same with our calculation. Therefore, we built the circuit correctly.

Reminder: Pay attention to the port we use on multimeter. The red port below the black port is used to measure current. Don’t use that port to measure voltage.

## Step 6: Conclusion

Congratulation! You have built a simple circuit successfully if you got same results with the pictures. The procedures you just did are the most basic thing that you will repeat every day if you choose to study Electrical Engineering. You will need to read much more difficult instructions to build lots of complicated circuits. Building this circuit successfully is a good beginning for your career of studying.

<p>This is impossible to understand for anyone who doesn't already know a lot about electronics, and virtually useless to anyone who already does. It requires advanced, expensive equipment, has no mention of how you calculated the values, etc.</p>