| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.60 |
| Score | 0% | 72% |
The valence shell of a semiconductor is how full of electrons?
less than half full |
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half full |
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more than half full |
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empty |
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.
The ampere is a unit of measurement for:
current |
|
power |
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inductance |
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energy |
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.
General current flow in a transistor is from __________ to __________.
base, collector |
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collector, base |
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base, emitter |
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collector, emitter |
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.
You would measure the amount of resistance at a certain point in a circuit with a(n):
potentiometer |
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ammeter |
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ohmmeter |
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voltmeter |
Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.
| 1080 V | |
| 361.5 V | |
| 360 V | |
| 540 V |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
V = \( I \times R \) = \( 6 \times 60 \) = 360 V