| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.98 |
| Score | 0% | 80% |
The valence shell of a semiconductor is how full of electrons?
half full |
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empty |
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more than half full |
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less than half full |
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.
You would measure the amount of voltage between two points in a circuit with a(n):
reostat |
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battery |
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voltmeter |
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ammeter |
Voltage (V) is the electrical potential difference between two points. A voltmeter is used to measure the voltage between two points in a circuit.
This circuit diagram represents a(n):
series circuit |
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rectifier |
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parallel circuit |
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series-parallel circuit |
In a parallel circuit, each load occupies a separate parallel path in the circuit and the input voltage is fully applied to each path. Unlike a series circuit where current (I) is the same at all points in the circuit, in a parallel circuit, voltage (V) is the same across each parallel branch of the circuit but current differs in each branch depending on the load (resistance) present.
Resistance is measured in:
coulombs |
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ohms |
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volts |
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amperes |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.
| 120 W | |
| 122 W | |
| 360 W | |
| 108 W |