| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.48 |
| Score | 0% | 70% |
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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the more resistive the conductor is the slower electron flow will be |
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electrically conductive materials have no resistive properties |
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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 volt is a unit of measurement for:
power |
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voltage |
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capacitance |
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current |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
From what energy do photovoltaic cells produce electrical energy?
magnetic |
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chemical |
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sun |
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nuclear |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
Capacitors store:
resistance |
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electricity |
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capacitance |
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current |
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.
What is the potential difference in an electrical circuit a measure of?
the current at a specific location in the circuit |
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the voltage at a specific location in the circuit |
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the resistance at a specific location in the circuit |
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the load at a specific location in the circuit |
Electrons flow from an area of high concentration to an area of low concentration. A high voltage indicates a high concentration of electrons that creates a greater potential for electron flow than a low voltage. When applied to a load, voltage creates electricity and potential difference is the measure of voltage at a specific location in an electrical circuit.