A resistor is a device without which it is impossible to assemble a single electrical circuit for any homemadein need of power supply. A resistor is a passive element of any electrical circuit, which in some cases has a constant, and in some cases a variable resistance value. Resistors are designed to linearly convert current to voltage or vice versa, as well as to limit current or absorb electrical energy. If, when creating your homemade product, you need to take any action with the current and the above, then you will need to use resistors.
The main parameter of any resistor is the nominal resistance. According to this parameter, each resistor is marked separately. Also the key parameters of any resistor are: ultimate power dissipation, temperature coefficient of resistance, ultimate operating voltage, excess noise. When choosing a resistor for your homemade product, you should be guided by these parameters.
Cost: ~ from 40