| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.15 |
| Score | 0% | 63% |
A diode to an electronic circuit is like a _______________ to a city?
traffic light |
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parking lot |
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one-way street |
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highway |
A diode allows current to pass easily in one direction and blocks current in the other direction.
The valence shell of a semiconductor is how full of electrons?
empty |
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half full |
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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.
An amplifier is most similar in function to which of the following:
transistor |
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step-up transformer |
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step-down transformer |
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capacitor |
An amplifier is a device that takes a small input signal and creates a larger output signal. This makes it most similar to a step-up transformer which takes a smaller input voltage and creates a larger output voltage.
This circuit diagram represents a(n):
series circuit |
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parallel circuit |
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open circuit |
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series-parallel circuit |
A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.
Which of the following is not a characteristic of direct current?
electrons flow in only one consistent direction |
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an example power source is a generator |
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used to power your cell phone |
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cannot easily travel distances without power loss |
Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of DC is a battery. In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.