| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.13 |
| Score | 0% | 63% |
Which of the following is not a terminal on a transistor?
collector |
|
emitter |
|
input |
|
base |
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.
The volt is a unit of measurement for:
power |
|
current |
|
capacitance |
|
voltage |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
Which of the following is not a characteristic of a step-up transformer?
increases voltage |
|
the secondary voltage is higher than the primary voltage |
|
has more turns in the secondary winding than in the primary winding |
|
the primary voltage is higher than the secondary voltage |
As their names indicate, a step-up transformer is used to step up or increase voltage and a step-down transformer is used to step down or decrease voltage. In a step-up transformer, the secondary voltage is higher than the primary voltage and it has more turns in the secondary winding than in the primary winding.
The valence shell of a semiconductor is how full of electrons?
empty |
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less than half full |
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half full |
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more 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.
Electromotive force is another name for:
current |
|
energy |
|
power |
|
voltage |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.