| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.17 |
| Score | 0% | 63% |
What is the voltage of most household electrical systems in the United States?
60Hz |
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220V |
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60V |
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110V |
Most households use electricity with a voltage of 110V.
The joule is a unit of measurement for:
resistance |
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capacitance |
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power |
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energy |
The joule is a unit of measurement for energy.
Which of the following is a characteristic of batteries connected in series?
total voltage equals the sum of the individual battery voltages |
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total voltage equals the average of the individual battery voltages |
|
two connections are made between each adjacent battery |
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the positive terminal of one battery is connected to the positive terminal of the next |
You can multiply the voltage or the current supplied by individual batteries by connecting them together either in series or in parallel. The characteristics of batteries connected in series are that total voltage equals the sum of the individual battery voltages, total current equals the average of the individual battery currents, the positive terminal of one battery is connected to the negative terminal of the next, and one connection is made between each adjacent battery.
The valence shell of a semiconductor is how full of electrons?
more than half full |
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empty |
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less than half full |
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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.
Direct current flows from the __________ terminal of the voltage source to the __________ terminal.
positive, negative |
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negative, positive |
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positive, positive |
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negative, negative |
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 direct current (DC) is a battery.