| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.90 |
| Score | 0% | 58% |
Which of the following is not a common type of battery?
deep-cycle |
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power-cycle |
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dry cell |
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wet cell |
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).
Which of the following statements about electrical resistance is true?
electrically conductive materials have no resistive properties |
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the more resistive the conductor is the slower electron flow will be |
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the less resistive the conductor is the slower electron flow will be |
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the more resistive the conductor is the faster electron flow will be |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
You would measure the amount of current through a circuit with a(n):
battery |
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voltmeter |
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ammeter |
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potentiometer |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). An ammeter is used to measure the electric current in a circuit.
What is the potential difference in an electrical circuit a measure of?
the voltage at a specific location in the circuit |
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the current at a specific location in the circuit |
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the load at a specific location in the circuit |
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the resistance 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.
In electrical wiring, which of the following are proportional?
the diameter of the wire and the amount of the voltage |
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the diameter of the wire and the amount of the current |
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the length of the wire and the amount of the voltage |
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the length of the wire and the amount of the current |
Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.