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Resistors
Bio Med Tech course 1
| Ansawer | |
|---|---|
| What is a resistor? | A device used to control current flow |
| The amount of resistance to current is measured in? | Ohms, the more ohms (higher ohmic value) a resistor has, the higher its resistance |
| Resistor is represented by the letter? | R |
| Resistors have a color code on it that is called? | Reference designation |
| Reference designation will? | Increase by one to identify each additional resistor. |
| What is this sybmol Ω? | Is the Greek letter omega that abbreviates ohm. 10 ohms= 10 Ω. |
| Insulators are considered to have ---to current flow? | Maximum resistance |
| As resistance increases? | Less current will flow |
| As resistance decreases? | More current will flow |
| Resistor is represented by either? | A rectangle or a zig-zag line |
| Resistors are classified in two types? | Fixed value or variable value |
| Fixed resistors are made with? | Specific ohmic value |
| Variable resistors are made so their? | Ohmic value can be adjusted or changed |
| Fixed resistors are classified in what three categories? | General purpose, Power, Precision |
| What is the most common resistor? | General purpose, becuase they are inexpensive and meet the needs of most circuit applications |
| Most widely used general purpose resistor is the? | Carbon resistor |
| How are carbon resistors identified? | By color bands which indicate their value |
| A carbon composition resistor has what type of body shape? | It has a cylindrical shaped molded body. |
| A carbon film resistor has what type of body shape? | It has a bone like shaped boy dipped in epoxy |
| Power resistors are used when? | When a circuit has a large current flow, such as in a power supply |
| Power resistors are normally made of? | Wire wound around a core. They may be called wire wound resistors |
| Precision resistors are used when? | When an exact value of resistance is necessary for a correct circuit operation |
| Precisions resistor's value are? | Either represented by a code written in letters or number or color bands |
| The value of resistance is normally? | Printed on the body of the resisor and followed by a Ω symbol, a k or an M. |
| Variable resistors are used to make? | Changes in a circuit's resistance or to vary the amount of current in a circuit. |
| What are the two types of variable resistors? | Potentiometers and Rheostats |
| Potentiometers are made of? | Carbon composition material formed in a broken cirle. The max ohm value is printed on the case. It has three leads are are configured to operateas a voltage divider controlling voltage by varying the circuit's resistance |
| Potentiometers are used when? | Circuit current flow is low. |
| Rheostats are made of? | Wire wound on a core in a broken circle. Its max ohm value is printed on the case They have two leads and are configured in a circuit to control current |
| Rheostats are used when? | With higher levels of current |
| What type of potentiometer is used to vary the resistance of a circuit and is well suited for use on a printed circuit card? | Trimmer potentiometer |
| What is a larger potentiometer called that is mounted on a chassis? | Control potentiometers. Used as a volume control on a radio |
| Resistors have three general characteristics? | Power rating. Tolerance. Ohmic value |
| What is a power rating? | It describes the amount of heat a resistor can safely give off. |
| If the amount of heat exceeds the power rating? | The resistor will "burn-up" |
| Power rating is measured in ---on a carbon composition resistor? | Watts |
| What resistor is not as likely to be damaged by heat as a carbon composition resistor? | Carbon film resistors |
| Carbon film resistors are smaller than? | Carbon composition resistors |
| What type of resistors are even less likely to be damaged by heat? | Wire wound resistors |
| What is tolerance also know as percent of error? | The amount of difference that is acceptable between the measured ohmic value and the indicated value. |
| Tolerance is usually described as? | Percent, such as 1%, 5%, 10%, etc. |
| If a 2000 ohm resistor has tolerance of 10% what is the actual value? | Anywhere between 1800 and 2200 ohms. 2000 x 10%=200 200-200=1800 2000+200=2200 |
| If a 2000 ohm resistor has tolerance of 1% what is the actual value? | Anywhere between 1980 and 2020 ohms. 2000 x 1%=20 2000-20=1980 2000+20=2020 |
| As tolerance decreases, the amount of the difference? | Decreases |
| Carbon based resistors are used when? | Circuits that only require the accuracy to be within 5% |
| Precision resistors are used when? | Circuits that require an accuracy to be within 1% |
| Resistor's tolerance is identified by? | A color band or is printed on the resistor. |
| How is the carbon resistor's tolerance indicated? | By the 4th color band |
| The power resistor's tolerance is? | Printed on the body |
| The precision resistor's tolerance is indicated by? | A code |
| Fixed resistors are made to have? | One ohmic value, the value can range from a fraction of an ohm (Ω) to tens of megohms (MΩ) |
| "BIG" Color Black represents? | Significant number 0 Multiplier 1 |
| "BOYS" Color Brown represents? | Significant number 1 Multiplier 10 |
| "RACE" Color Red represents? | Significant number 2 Multiplier 100 |
| "OUR" Color Orange represnts? | Significant number 3 Multiplier 1,000 |
| "YOUNG" Color Yellow represents? | Significant number 4 Multiplier 10,000 |
| "GIRLS" Color Green represents? | Significant number 5 Multiplier 100,000 |
| "BUT" Color Blue represents? | Significant number 6 Multiplier 1,000,000 |
| "VIOLET" Color Violet represents? | Significant number 7 Multiplier 10,000,000 |
| "GENERALLY" Color Gray represnets? | Significant number 8 Multiplier 100,000,000 |
| "WINS" Color White represents? | Significant number 9 Multiplier 1,000,000,000 |
| Color Gold represents? | Multiplier 0.1 Tolerance 5% |
| Color Silver represents? | Multiplier 0.01 Tolerance 10% |
| No Color represents? | Tolerance 20% |
| The first color band represents? | The first number in the resistance value |
| The second color band represents? | The second number in the resistance value |
| The third color band represents? | The multiplier or number of zeros to add to the value of the resistor. |
| The fourth color band represents? | The tolerance |
| Military resistors and precision resistors using color bands have five bands. What is the fifth band? | The fifth band is the reliability band. It indicates the percentage of failures for a group of identical resistors during 1000 hours of standard operation |
| To get the ohmic value of a resistor? | Put the value of first band then the value of the second band and add the proper number of zeros that the 3rd band indicates. |
| Number/Letter Codes also represent? | A resistor's value |
| These codes are called military specification codes. | CGW RN65D 3572FJ |
| The four digits indicate? CGW RN65D 3572FJ? | The ohmic value |
| The digit 3 is the? CGW RN65D 3572FJ? | The first significant digit |
| The digit 5 is the? CGW RN65D 3572FJ? | The second significant digit |
| The digit 7 is the? CGW RN65D 3572FJ? | The third significant digit |
| The digit 2 is the? CGW RN65D 3572FJ? | The multiplier or number of zeros |
| The ohmic value in CGW RN65D 3572FJ? | 35700 Ohms or 35.7 KΩ |
| What is the tolerence codes in the military specification code. | F-1% G-2% J-5% |
| What is the letter J in CGW RN65D 3572FJ represent? | J is used for special purposes. In this case means this resistor meets military specifications |
| What does the code 3572FJ mean? | The code 3572FJ means. 3572- 35700 ohms or 35.7 KΩ F-1% tolerance J- Meets military specifications |
| What does the R in CGW RN65D 3572FJ mean? | The first letter indicates the component is a resistor |
| What does the N in CGW RN65D 3572FJ mean? | The second letter is the style. N- Metal Film, W- Wire Wound, CR- Carbon |
| What does the 65 in CGW RN65D 3572FJ mean? | The two numbers indicate the power rating, or watt size. 55- 1/8 Watt, 60- 1/4 Watt, 65-1/2 Watt |
| What does the D in CGW RN65D 3572FJ mean? | The D indicates the temperature coefficient. This tells the user how much the ohmic value can change as a result of a temperature change. |
| Which symbol represents a fixed resistor? | Zig-Zag line |
| How is the value of resistance marked on a power resistor? | Printed |
| The higher the ohmic value? | The highter the resistance The less current flows |
| What does R stand for? | Resistor |
| What does N stand for? | Metal film |
| What does CR stand for? | Carbon |
| What does W stand for? | Wire Wound |
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