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Potentiometer. 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. Electronic symbol for pre-set potentiometer. Diode. Closeup of a diode, showing the square-shaped semiconductor crystal (black object on left).


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. Crocodile clip. 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.

Crocodile clip

Pair of standard clips Small versions, ranging in size from 15–40 mm in length, are used in electrical laboratory work. Specifications[edit] 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). Capacitor. 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 (e.g., when a capacitor is attached across a battery), an electric field develops across the dielectric, causing positive charge (+Q) to collect on one plate and negative charge (-Q) to collect on the other plate.

If a battery has been attached to a capacitor for a sufficient amount of time, no current can flow through the capacitor. However, if an accelerating or alternating voltage is applied across the leads of the capacitor, a displacement current can flow. Photoresistor. The symbol for a photoresistor[1] A photoresistor or light-dependent resistor (LDR) or photocell is a light-controlled variable resistor.


The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits. A photoresistor is made of a high resistance semiconductor. In the dark, a photoresistor can have a resistance as high as a few megaohms (MΩ), while in the light, a photoresistor can have a resistance as low as a few hundred ohms.