| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.46 |
| Score | 0% | 69% |
A diode to an electronic circuit is like a _______________ to a city?
traffic light |
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highway |
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one-way street |
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parking lot |
A diode allows current to pass easily in one direction and blocks current in the other direction.
From what energy do photovoltaic cells produce electrical energy?
magnetic |
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nuclear |
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sun |
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chemical |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
Which of the following is not a terminal on a transistor?
input |
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base |
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collector |
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emitter |
A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.
Why does current in an electric circuit create heat?
heat is created when the current overcomes resistance in the wire |
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current is naturally hot |
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the wire in the circuit burns when current passes through |
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voltage is naturally hot |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.
Electrical power is measured in:
watts |
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amperes |
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volts |
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coulombs |
Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.