| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.90 |
| Score | 0% | 58% |
A diode to an electronic circuit is like a _______________ to a city?
traffic light |
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parking lot |
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one-way street |
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highway |
A diode allows current to pass easily in one direction and blocks current in the other direction.
In an electronic circuit, a thermocouple can be used to:
link the temperature of one component in the circuit to that of another component in the circuit |
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keep the circuit at a designated safe temperature |
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open or close a circuit at a designated temperature |
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increase or decrease the temperature of a component in the circuit |
A thermocouple is a temperature sensor that consists of two wires made from different conductors. The junction of these two wires produces a voltage based on the temperature difference between them and can be used like a switch to open or close the circuit at a designated temperature.
This circuit component symbol represents a(n):
resistor |
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inductor |
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capacitor |
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transformer |
An inductor is coiled wire that stores electric energy in the form of magnetic energy and resists changes in the electric current flowing through it. If current is increasing, the inductor produces a voltage that slows the increase and, if current is decreasing, the magnetic energy in the coil opposes the decrease to keep the current flowing longer. In contrast to capacitors, inductors allow DC to pass easily but resist the flow of AC.
From what energy do photovoltaic cells produce electrical energy?
sun |
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chemical |
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nuclear |
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magnetic |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
Which of the following is not a characteristic of a step-up transformer?
has more turns in the secondary winding than in the primary winding |
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the primary voltage is higher than the secondary voltage |
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increases voltage |
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the secondary voltage is higher than the primary 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.