| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.88 |
| Score | 0% | 58% |
In metals, increasing the temperature typically _____________ conductivity.
does nothing to |
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decreases |
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increases |
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eliminates |
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.
From what energy do photovoltaic cells produce electrical energy?
nuclear |
|
magnetic |
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sun |
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chemical |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.
parallel |
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series |
|
closed |
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series-parallel |
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.
The valence shell of a conductor is how full of electrons?
half full |
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less than half full |
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full |
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more than half full |
Conductors are elements that allow electrons to flow freely. Their valence shell is less than half full of electrons that are able to move easily from one atom to another.
This circuit diagram represents a(n):
parallel circuit |
|
rectifier |
|
series-parallel circuit |
|
series circuit |
In a parallel circuit, each load occupies a separate parallel path in the circuit and the input voltage is fully applied to each path. Unlike a series circuit where current (I) is the same at all points in the circuit, in a parallel circuit, voltage (V) is the same across each parallel branch of the circuit but current differs in each branch depending on the load (resistance) present.