PCB mount trimmer potentiometers, or "trimpots", intended for infrequent adjustment. Comparing 2 different type of pots Size scaled 10k and 100k pots that combine traditional mountings and knob shafts with newer and smaller electrical assemblies. Shaft length is unrelated to resistance. Potentiometer
Figure 1: Closeup of a diode, showing the square shaped semiconductor crystal (black object on left). Figure 3: Structure of a vacuum tube diode. The filament may be bare, or more commonly (as shown here), embedded within and insulated from an enclosing cathode Diode
Standard clip Three alligator clips: a bare standard-sized clip; a miniature clip in a yellow plastic boot; a large red Square D multi-function clip. Pair of standard clips Small versions, ranging in size from 15–40 mm in length, are used in electrical laboratory work. Specifications Crocodile clip
Resistor Axial-lead resistors on tape. The tape is removed during assembly before the leads are formed and the part is inserted into the board. In automated assembly the leads are cut and formed. The current through a resistor is in direct proportion to the voltage across the resistor's terminals. This relationship is represented by Ohm's law: where I is the current through the conductor in units of amperes, V is the potential difference measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms (symbol: Ω).
4 electrolytic capacitors of different voltages and capacitance Solid-body, resin-dipped 10 μF 35 V tantalum capacitors. The + sign indicates the positive lead. When there is a potential difference across the conductors, an electric field develops across the dielectric, causing positive charge to collect on one plate and negative charge on the other plate. Energy is stored in the electrostatic field. An ideal capacitor is characterized by a single constant value, capacitance. Capacitor
Photoresistor The symbol for a photoresistor A photoresistor or light-dependent resistor (LDR) or photocell is a resistor whose resistance decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor is made of a high resistance semiconductor. If light falling on the device is of high enough frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band. The resulting free electron (and its hole partner) conduct electricity, thereby lowering resistance. A photoelectric device can be either intrinsic or extrinsic.