This is known for an Australian rock band whose guitarist wears a school uniform – in terms of electric
power, the AC stands for Alternating Current, and DC is the acronym for Direct Current, which translates
to DC. Current is measured in units of amperes (A) and marked in formulas and diagrams with the
symbol I. The current flowing in the circuit depends not only on the magnitude of the voltage but also on
the size of the resistor used. Here every consumer, such as light bulb, LED, motor, etc., in a circuit may
only be connected to the appropriate voltage for him. The interaction between voltage, current and
resistance can be calculated with the URI formula familiar from the school:
Electrical voltage U = resistance R * current I
The electrical power is expressed in watts (W) and with the formula:
Power P = electrical voltage U * current I
Completely the circuit is next to the voltage source described (battery, battery, socket, etc.) only with
one or several ren connected consumers such as a light bulb or a motor. Each connected consumer has
its own electrical resistance, and some consumers, such as LEDs, require additional resistance if the
applied voltage or current is too high. The unit of resistance is known as ohms (Q), which can be easily
calculated using the URI formula – in circuit diagrams and programs, resistors are marked with an R
Use the plug-in board correctly
The way to the finished board usually leads via a simple board. This is especially useful for the circuit
design with the GPIO connections of the Raspberry Pi or the connection to an Arduino, especially for
those who are reluctant to use a soldering iron or soldering station right from the start. Plug-in boards
are available in almost all sizes and price categories, from 10 € you get a reasonably suitable board.
Cheaper and more practical here are complete sets, which in addition to the plug-in board also have
accessories such as resistors, LEDs, etc. already included. The most important thing here is of course the
plug-in board. The amount of LEDs included in the learning package will probably not be needed for
now, but at least it’s better to have them than to head out to the electronics retailer for every single LED
At Franzis, these learning packages are divided into the areas of lighting / LED, sensors, IC development
and others, to each of which is a book with the appropriate experiments with.
Electronic projects with in the box. For the start with the Arduino, a Raspberry Pi or even without a
microcontroller, the plug-in board in the Franzis LED kit is more than adequate.
Orient the board in front of you so that the numbers printed on it are correct. In the middle you see two
subdivided pin areas, on which at least five pins (a-e and f-j) are arranged in a horizontal row and
connected to each other. The connection pins, which are interconnected in the figure, are in electrical
contact with each other. In addition to resistors, LEDs, ICs, etc., you also need cable connectors or cable
bridges that fit into the small pin openings of the plug-in board.