| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.97 |
| Score | 0% | 59% |
Which of the following is not a characteristic of a step-up transformer?
the primary voltage is higher than the secondary voltage |
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has more turns in the secondary winding than in the primary winding |
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the secondary voltage is higher than the primary voltage |
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increases voltage |
As their names indicate, a step-up transformer is used to step up or increase voltage and a step-down transformer is used to step down or decrease voltage. In a step-up transformer, the secondary voltage is higher than the primary voltage and it has more turns in the secondary winding than in the primary winding.
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 resistance 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 voltage 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.
Direct current flows from the __________ terminal of the voltage source to the __________ terminal.
negative, negative |
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positive, positive |
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positive, negative |
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negative, positive |
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.
You would measure the amount of current through a circuit with a(n):
potentiometer |
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ammeter |
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battery |
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voltmeter |
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.
The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.
closed |
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series |
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parallel |
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series-parallel |
A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.