| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.52 |
| Score | 0% | 70% |
The formula specifying Ohm's law is which of the following?
V = I2R |
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\(V = {R \over I}\) |
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V = IR |
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\(V = {I \over R}\) |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Which of the following can conduct electricity under some conditions but not others?
insulator |
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conductor |
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semiconductor |
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resistor |
Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.
A transistor to an electronic circuit is like a _______________ to a house?
safe |
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gate |
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no trespassing sign |
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driveway |
A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor. A transistor acts as a gate or switch for electronic signals.
A transistor works by allowing a small amount of current to control general current flow. Where is the small amount of current applied?
input |
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collector |
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emitter |
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base |
The transistor is the foundation of modern electronic devices. It is made entirely from semiconductor material (making it a solid state device) and can serve many different functions in a circuit including acting as a switch, amplifier, or current regulator. A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.
Current is the rate of flow of electrons per unit time and is measured in:
volts |
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coulombs |
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amperes |
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ohms |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.