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Risistor Resistors determine the flow of current in an electrical circuit. Light Dependent Resistor (LDR) LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Transistor Transistors can be regarded as a type of switch, as can many electronic components. Variable Resistor (Trim Pot) Dark/light and temperature sensors usually have these components, as the potentiometer / variable resistor allows the circuit to be made more or less sensitive (they can be turned up or down reducing or increasing resistance). Diode A diode allows electricity to flow in one dir ection only and blocks the flow in the opposite direction. Switch This switch is common on many electrical devices. For example they are found on computer units for turning them on and off. PCB Motor The software allows the circuit designer to build a circuit on the screen of a computer rather than building a real circuit out of expensive components. 2 Capacitor A capacitor (originally known as a condenser) is a passive two-terminal electrical component used to store electrical energy temporarily in an electric field. The forms of practical capacitors vary widely, but all contain at least two electrical conductors (plates) separated by a dielectric (i.e. an insulator that can store energy by becoming polarized). 2 Integrated Ciruit (IC) Digital integrated circuits can contain anywhere from one to millions of logic gates, flip-flops, multiplexers, and other circuits in a few square millimeters. 1