Electronic Basic

Understanding computer hardware without knowing basic electronics is like learning to drive a car without knowing how the engine works. This chapter will build your foundation before touching complex components like a motherboard or processor. All digital systems are essentially the manipulation of high-precision electric currents.

1. Atomic Foundation: The Origin of Electricity#

All advanced technology today works by manipulating the smallest particles in the universe. To understand electricity, we must look into the structure of the atom.

[Image of atom structure showing protons, neutrons, and electrons]

• Atomic Nucleus: The center of mass consisting of Protons (positively charged) and Neutrons (neutral).
• Electrons: Negatively charged particles that orbit the nucleus.
• Valence Electrons: Electrons located in the outermost orbit. Because they are far from the nucleus, their bond is weak and they are easily detached.
• Electric Current: Occurs when these valence electrons jump from one atom to another continuously and in one direction due to a potential difference (voltage).

2. Current Classification: AC vs DC#

In the computer world, these two types of current are used side-by-side but for very different purposes.

Computer Analogy: The Power Supply (PSU) acts as a “translator” that converts AC from the wall into stable DC to feed internal components.

3. Main Variables: Voltage, Current, and Resistance#

To understand how a circuit works, we can use the Water Pipe Analogy:

1. Voltage (V): Measured in Volts. This is “Water Pressure.” The force that pushes electrons to flow through the cable.
2. Current (I): Measured in Amperes. This is “Water Flow Rate.” The number of electrons flowing past a point in one second.
3. Resistance (R): Measured in Ohms (Ω). This is the “Pipe Diameter.” The property of a material that obstructs or limits the flow of electricity.

4. Passive Components: The Stability Guardians#

Before moving on to active components like transistors, you must know the “Triple Threat” of passive components:

A. Resistor#

Functions to limit electric current. Without a resistor, components like LEDs will burn out because they receive excessive current.

• Symbol: Zig-zag line or a small rectangle.

B. Capacitor (Charge Storage)#

Like a small backup water tank. It stores electrical energy temporarily and releases it when the voltage drops.

• Function in PC: Ensures the power supply to the processor remains smooth despite small fluctuations.

[Image of different types of capacitors: electrolytic and ceramic]

C. Inductor (Coil)#

Stores energy in the form of a magnetic field. Used to filter high-frequency interference (noise) so that data signals do not become corrupt or encounter errors.

5. Ohm’s Law: The Rules of Electronics#

Ohm’s Law is the fundamental formula that connects Voltage, Current, and Resistance. Since mathematical formulas sometimes do not display well on the web, use the text guide below:

Formula Triangle:#

• V = I x R (Voltage = Current multiplied by Resistance)
• I = V / R (Current = Voltage divided by Resistance)
• R = V / I (Resistance = Voltage divided by Current)

Practical Case Example:#

You have a 9 Volt battery and an LED bulb that can only receive a maximum current of 0.02 Amperes. How much resistance (Resistor) is needed so the LED doesn’t blow out?

How to Calculate:

1. Use the formula to find R: R = V / I
2. Enter the numbers: R = 9 / 0.02
3. The result: R = 450 Ohms

6. Practical Project: Assembling a Series LED Circuit#

Let’s apply the theory above into a real single-path circuit.

Tools and Materials List:#

1. Power Source: 9V Battery (Power source).
2. Control: Switch (The door to cut/connect the current).
3. Protection: 470 Ohm Resistor (Guard to keep the LED from exploding).
4. Output: LED (Indicator light).
5. Medium: Jumper Wires (The highway for electrons).