Hila Research Centre
This document is a brief introduction to electronics. Check the sources
at the bottom for some recommended reading and dealers in electronic supplies
- Electronics is the technology of controlling the flow of electrons.
- Electrons exist as particles swirling around the nucleus of
- When an electromotive force is present, electrons will move
through some materials.
- The force moving electrons is measured in volts.
- A battery is a chemical device, designed to provide the force
needed to move electrons.
- Electrons move from the (-) end of the battery and are attracted
to the (+) end.
- A circuit is a complete path ( - to + ) for electrons to move
- Some materials impede the flow of electrons, this is called resistance.
- Resistors are devices designed to provide resistance in a circuit.
- Resistance is measured in ohms.
- The number of electrons moving in a circuit is called current.
- Current is measured in amperes (amps).
- The relationship among voltage, current and resistance is defined by
- Ohm's law: voltage = current x resistance, V = I*R
- V = voltage (volts), I = current (amps), R = resistance (ohms)
A basic circuit:
- 1 LED (Radio Shack # 276-18)
- 1 - 1000 ohm resistor (Radio Shack # 271-1321)
- 1 - 9V Battery
- 1 - 9V Battery clip (Radio Shack # 270 - 325)
(Light Emitting Diodes) are easily damaged if too much current flows through
them. For this reason it is necessary to use a resistor to reduce the current
flow. Note that LED's have a "+" and "-" lead, the
"-" lead is beside a "notch" in the plastic base of
the LED. If you connect an LED backwards it won't work. See "Sources"
at the bottom for ideas on where you can get more information.
Radio Shack stores are found throughout Canada
and the United States making them a convenient source for electronic supplies
and equipment. The stores carry a complete stock of basic electronic supplies.
Some recommended products from Radio Shack:
- Getting Started in Electronics (an excellent book) RS # 276-5003
- Engineers Mini Notebooks (series of project books) RS # 276-50**
- Lab Kits (complete electronic kits) RS # 28-161, 28-265, 28-270,
Active Electronic Components stores are found
throughout Canada and the United States. These stores carry an extensive
stock of electronic supplies and equipment for both the hobbyist and the
Active is an excellent source for components and breadboards (# 70H05).