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Descrição
FlashCards por That Yeti Dog Person, atualizado more than 1 year ago
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Criado por That Yeti Dog Person
aproximadamente 4 anos atrás
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| Questão | Responda |
| A material is called a ______ if electricity can flow through it easily. (an example of this is copper) | conductor |
| Some materials, such as rubber, are called ______ because they have very high resistance to the flow of energy. | insulators |
| ______ is the flow of electrons in a medium. (such as copper) | Current |
| Current is measured in units called ______. | amperes |
| ______ is the abbreviation of amperes. | A or amps |
| ______ is the electrical pressure that forces electrons to flow through a medium. | Voltage |
| Voltage is measured in units called _____. | volts |
| ______ is the abbreviation for volts. | V |
| ______ is the opposition to current flow presented by a medium. | Resistance |
| Resistance is measured in units called ______. | ohms |
| Ohms is often represented by the Greek letter ______. | omega |
| ____________ are used by technicians as a form of "shorthand" to show how components are connected in circuits. | Schematic diagrams |
| _______ has a high resistance to current flow. It is often used as a heating element. (such as in a toaster) | Nichrome |
| Heating elements are also called _________. | resistive elements (resistance is what makes them heat up) |
| The resistive element in a _______ resistor is carbon mixed with a non-conducting substance, such as clay. In this type of resistor, the ratio of carbon to clay determines how much resistance it will have. (the more clay, the more resistance) | carbon |
| The ______ resistor uses nichrome wire as the resistive element. In this type of resistor, resistance value can be varied by making the wire longer or thinner. (the longer & thinner the wire, the more resistance) | wirewound |
| Batteries are a common source of ______ current. | direct |
| _____ is the abbreviation for direct current. | DC |
| Ordinary household current is ______ current. | alternating |
| ______ is the abbreviation for alternating current. | AC |
| One complete reversal of AC is called a _____. | cycle |
| The rate at which AC cycles occur is called the ______. | frequency |
| Frequency is measured in units called ______. | hertz |
| _____ is the abbreviation for hertz. | Hz |
| Most electronic equipment runs on _____ current. | DC |
| To turn AC current to DC current, it needs to be ______. | rectified |
| In many circuits, the process of rectification is completed by a component called a _____. | diode |
| The action of converting AC current to DC current is called ______. | rectification |
| Diodes are often called ______. | rectifiers |
| The two ends of a diode are called the ______ and the ______. | anode, cathode |
| A diode will always be marked in some way to identify its ______ end. | cathode |
| The ______ end of a diode must be connected to the negative side of the voltage source in order for it to conduct electricity. | cathode |
| ______ are a broad group of components that are used to convert some kind of environmental energy into electrical signals. (such as in a thermostat) | Sensors |
| A ______ is a resistor that responds to temperature changes by changing its resistance. | thermistor |
| A transistor had three leads: ______, ______, and ______. | base, emitter, & collector |
| The most basic operation of a transistor is _______. | amplification |
| On a printed circuit board, the components will be mounted from the ______ side of the board. | substrate |
| The substrate side of a printed circuit board is also called the ______ side. | component |
| The side of a printed circuit board that contains the conducting paths is called the ______ side. | foil |
| A ______ is used to measure electrical values such as ohms, amperes, and volts in circuits. | multimeter |
| Faults in electrical equipment often occur in the sections where voltages are converted. In these cases a piece of test equip. called a ______ can be used to test the device. | power supply |
| Electrical test equipment with screens that display readouts in digits have ______ displays. | digital |
| Electrical test equipment with displays that use pointers and scales to give readouts have ______ displays. | analog |
| The ______ is an instrument that measures electrical signals and displays them on a tv-like screen. | oscilloscope |
| A ________ is a troubleshooting tool that's used to produce simulated electronic signals in a circuit. | signal generator |
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