| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.44 |
| Score | 0% | 69% |
A transistor to an electronic circuit is like a _______________ to a house?
driveway |
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gate |
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no trespassing sign |
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safe |
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. A transistor acts as a gate or switch for electronic signals.
Direct current flows from the __________ terminal of the voltage source to the __________ terminal.
positive, positive |
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negative, positive |
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positive, negative |
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negative, negative |
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.
From what energy do photovoltaic cells produce electrical energy?
sun |
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chemical |
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magnetic |
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nuclear |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
Resistance and current are __________ proportional.
not |
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inversely |
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exponentially |
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directly |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.
Why does current in an electric circuit create heat?
the wire in the circuit burns when current passes through |
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current is naturally hot |
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heat is created when the current overcomes resistance in the wire |
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voltage is naturally hot |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.