| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.36 |
| Score | 0% | 67% |
This circuit component symbol represents a(n):
transformer |
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DC source |
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AC source |
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capacitor |
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.
Which of the following is not a characteristic of direct current?
an example power source is a generator |
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cannot easily travel distances without power loss |
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electrons flow in only one consistent direction |
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used to power your cell phone |
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 DC is a battery. 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.
Longer the electrical wires mean _______________ voltage drop.
complete |
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lesser |
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diminishing |
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greater |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
You would measure the amount of voltage between two points in a circuit with a(n):
ammeter |
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reostat |
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battery |
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voltmeter |
Voltage (V) is the electrical potential difference between two points. A voltmeter is used to measure the voltage between two points in a circuit.
The rate of flow of electrons per unit time is which of the following?
resistance |
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voltage |
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conductance |
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current |
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.