| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.20 |
| Score | 0% | 64% |
Which of the following statements about electrical resistance is true?
the more resistive the conductor is the faster electron flow will be |
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electrically conductive materials have no resistive properties |
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the more resistive the conductor is the slower electron flow will be |
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the less resistive the conductor is the slower electron flow will be |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
The farad is a unit of measurement for:
inductance |
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capacitance |
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energy |
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power |
Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.
Which of the following is not an advantage of semiconductors over conductors?
a semiconductor conducts current better than a conductor |
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a semiconductor's conductivity can be varied under an external electrical field |
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materials to produce semiconductors are cheap and abundant |
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a semiconductor exhibits increased conductivity with increased temperatures |
A semiconductor is a material that has a limited ability to conduct electrical current with conductivity between that of an insulator and that of a conductor. Silicon, a cheap and abundant material, is the most used semiconductor material although other materials are used in the electronics components made from semiconductors. The primary advantages of a semiconductor over a conductor is that the conductivity of a semiconductor can be varied under an external electrical field giving engineers precise control over complex circuits and, unlike conductors like metals, a semiconductor's conductivity increases with increased temperatures.
Longer the electrical wires mean _______________ voltage drop.
diminishing |
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greater |
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lesser |
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complete |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
Which of the following is not a terminal on a transistor?
base |
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emitter |
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collector |
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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.