| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.25 |
| Score | 0% | 65% |
A diode to an electronic circuit is like a _______________ to a city?
highway |
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parking lot |
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one-way street |
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traffic light |
A diode allows current to pass easily in one direction and blocks current in the other direction.
This circuit diagram represents a(n):
series-parallel circuit |
|
open circuit |
|
series circuit |
|
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.
Current is the rate of flow of electrons per unit time and is measured in:
amperes |
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ohms |
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volts |
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coulombs |
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.
Alternating current changes __________ many times each second.
period |
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resistance |
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direction |
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frequency |
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.
In metals, increasing the temperature typically _____________ conductivity.
eliminates |
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does nothing to |
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decreases |
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increases |
All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.