These resistors are so small that several of them can be packaged in a single casing like the one shown in Figure 6a. Integrated resistors have the advantage of being extremely small. Integrated resistors are micro-miniature components that are made using semiconductors other than carbon. A wire-wound resistor has more surface area than a comparable carbon-composition resistor, so it can dissipate more heat. Wire wound resistors are used primarily in high-power applications that is, applications where components must be able to dissipate (throw off) a relatively high amount of heat. The longer the wire, the higher the resistance of the component.įigure 5 Wire-wound resistor construction. The value of the component is determined by the length of the wire between the leads. A wire-wound resistor is illustrated in Figure 5. Controlling the impurity levels makes it possible to produce carbon composition resistors with a wide range of values.įigure 4 Resistor manufacturing environment.Ī WIRE WOUND RESISTOR uses the resistivity of a length of wire as the source of its resistance. By adding IMPURITIES (other elements) to carbon during the manufacturing process, the resistivity of the carbon can be increased or decreased, depending on the amount and type of impurity used. The value of the carbon-composition resistor is determined primarily by the purity of the carbon. The relatively high resistivity of the carbon is the source of the resistor’s opposition to current.įigure 3 Current passing through a resistor. When current enters the resistor, it passes through the carbon that separates the leads, as shown in Figure 3. As you can see, the resistor has two metal leads (conductors) that are separated by carbon. The conductance of the carbon composition resistor is illustrated in Figure 2. Determine the length and resistance of each piece if the total resistance is 75 \(\Omega\).The most commonly used resistor is the CARBON COMPOSITION RESISTOR. The total length of the two wires is 200 meters. A length of AWG 26 wire is attached to one end of a length of AWG 32 wire. If the measurement is 4.50 \(\Omega\), determine the length of the wire and the possible inaccuracy (in feet or meters).Ħ0. A 2000 count DMM with \(\pm\)1% accuracy is used to measure the resistance of a spool of AWG 22 wire. Given a 9 volt battery with a 100 mAh rating, determine the total energy storage in joules.ĥ9. Given a 1.5 volt battery with a 500 mAh rating, how much current can it produce continuously for 25 hours?.ĥ8. Assuming electricity costs 14 cents/kWh, determine the total cost of running incandescent lights versus LEDs for 40,000 hours.ĥ7. The LED bulbs cost $5.50 each and have an expected life of 20,000 hours. In comparison, you can buy an LED light bulb that produces the same amount of light but only consumes 7 watts. Assume that you can buy standard 60 watt incandescent light bulbs for 50 cents each and that each has an expected life span of 1000 hours. What is the charge in coulombs of a million million (\(10^+ = $4.93\)ĥ6. If it reads a voltage of 7.00 volts, what is the possible range of the true voltage?ħ.
![2.2 k resistor color code 2.2 k resistor color code](https://images-na.ssl-images-amazon.com/images/I/61qRNZgXOkL._SL1500_.jpg)
A 50000 count digital multimeter has an accuracy specification of \(\pm\)0.1% and \(\pm\)4 counts. If it reads a voltage of 7.00 volts, what is the possible range of the true voltage? Answer 5 6.81V to 7.19VĦ. A 2000 count digital multimeter has an accuracy specification of \(\pm\)2% and \(\pm\)5 counts. Determine the expected current scales for a standard “three and a half” digit meter between 1 mA and 1 amp.ĥ. Answer 3 2 Volt, 20Volt, and 200 Volt scalesĤ. Determine the expected voltage scales for a standard “three and a half” digit meter between volts. If it reads a current of 142.0 mA, what is the possible range of the true current?ģ. A 4000 count digital multimeter has an accuracy specification of \(\pm\)0.5%. If it reads a voltage of 34.2 volts, what is the possible range of the true voltage? Answer 1 33.858V to 34.542VĢ.
![2.2 k resistor color code 2.2 k resistor color code](https://i0.wp.com/www.electronicshub.org/wp-content/uploads/2014/12/Four-Band-Resistor-Color-Code.jpg)
A 2000 count digital multimeter has an accuracy specification of \(\pm\)1%.