| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.31 |
| Score | 0% | 66% |
Which of the following is not a terminal on a transistor?
base |
|
emitter |
|
collector |
|
input |
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:
amperes |
|
coulombs |
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volts |
|
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.
| series | |
| perpendicular | |
| series-parallel | |
| parallel |
Connecting the 6 batteries in series multiplies their voltage while keeping their current the same yielding a 90V 15A configuration. Connecting the 6 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 15V 90A configuration. Using a series-parallel connection, 3 batteries can be connected in series and 3 can be connected in parallel resulting in a 45V 45A configuration.
Which of the following will increase the magnetic field produced by the electric current in a wire?
wind the wire into a coil |
|
construct the wire from conductive material |
|
wrap the wire around a ceramic core |
|
construct the wire from insulative material |
A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.
Which of the following can conduct electricity under some conditions but not others?
insulator |
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semiconductor |
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conductor |
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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.