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Unformatted text preview: 4.1 Overview When drawing circuit diagrams each component is represented by it’s own symbol. The list of circuit elements you’ll be working with is as follows: • Resistor (unit: ohm) - a passive component which dissipates energy when it passes a current this results in a voltage drop. • Capacitor (unit: farad) - a passive component of two conductors which stores energy in electric fields. • Inductor (unit: henry) - a passive solenoid shaped component which stores energy in magnetic fields. • EMF (DC Voltage Source) (unit: volt) - a non-passive component which maintains a constant voltage difference independent of the load placed across it; an example would be a battery. • Light Bulb (unit: ohm) - similar to a resistor but it dissipates energy by emitting visible light; in general it does not have constant resistance. Figure 1: The symbols for some of the commonly seen circuit components. 4.2 PASCO Electronics Lab Board To aid in the reliable configuring of your circuits you’ve been provided the PASCO Electronics Lab Board (Figure ?? ). The Lab Board is a medium on which you can assemble your circuit components in series or parallel, mount batteries to be used as EMF’s, incorporate light bulbs or variable resistors, attach probes and signal generators, as well as a variety of other capabilities. The aspects of the Lab Board which will be of primary use in this and subsequent labs are as follows: • Two D-cell battery holders- They are located along the left side and have electric leads mounted to the board. 3 Figure 2: PASCO Electronics Laboratory Board • Eight electric leads- Coil shaped and mounted along the bottom of the board, these allow you to assemble together your circuit; the leads of circuit components fit securely into the turns of the coil. • Two Banana Plug jacks- Connected to the two right most electric leads, these allow for the attachment of your DMM, Power Amplifier or other probe device. Before moving on to the next section be sure to locate these components of the Lab Board and familiarize yourself with their function. 4.3 Resistor Code Now take a closer look at one of your resistors. Note the series of colored bands that wrap around it’s barrel. You can see an example of this in Figure ?? . This is the “resistor color code” which specifies the resistance value of the component. Numbers 0-9 are represented each by a different color. In Table ?? are the colors and their corresponding number value. # 1 2 3 4 5 6 7 8 9 Color Black Brown Red Orange Yellow Green Blue Violet Gray White Table 1: Resistor code number reference You may notice there is also a band of either gold or silver. This is the tolerance band; it tells you how close to the stated value you can expect to find the actual resistance. Gold indicates 5% tolerance and Silver indicates 10%....
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- Spring '11
- Resistance, Resistor, power amplifier, Current Probe