| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
The hertz is a unit of measurement for:
inductance |
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energy |
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frequency |
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power |
The hertz is a unit of measurement for frequency.
Which of the following is not a common type of battery?
wet cell |
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dry cell |
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power-cycle |
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deep-cycle |
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. The three most common types of batteries are dry cell (used in small devices like TV remotes), wet cell (used for cars), and deep-cycle (storage batteries used primarily for backup and emergency power).
Why does current in an electric circuit create heat?
current is naturally hot |
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the wire in the circuit burns when current passes through |
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heat is created when the current overcomes resistance in the wire |
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voltage is naturally hot |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.
In metals, increasing the temperature typically _____________ conductivity.
increases |
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does nothing to |
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decreases |
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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.
Which of the following is a characteristic of batteries connected in parallel?
total current equals the sum of the individual battery currents |
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one connection is made between each adjacent battery |
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total current equals the average of the individual battery currents |
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the positive terminal of one battery is connected to the negative 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 parallel are that total voltage equals the average of the individual battery voltages, total current equals the sum of the individual battery currents, the positive terminal of one battery is connected to the positive terminal of the next, the negative terminal of one battery is connected to the negative terminal of the next, and two connections are made between each adjacent battery.