| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
Which of the following is a difference between a circuit breaker and a fuse?
all of these |
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a circuit breaker can be reused |
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a fuse is cheaper than a circuit breaker |
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a fuse responds more quickly than a circuit breaker |
Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.
General current flow in a transistor is from __________ to __________.
base, emitter |
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collector, base |
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collector, emitter |
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base, collector |
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.
Which of these materials is not a good conductor of electricity?
gold |
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tin |
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copper |
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air |
All conductors have resistance and the amount of resistance varies with the element. In general, metals make the best conductors of electricity and non-metals make the worst conductors of electricity.
A transistor works by allowing a small amount of current to control general current flow. Where is the small amount of current applied?
base |
|
emitter |
|
collector |
|
input |
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 current through a circuit with a(n):
ammeter |
|
potentiometer |
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battery |
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voltmeter |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). An ammeter is used to measure the electric current in a circuit.