| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
Voltage and current are __________ proportional.
indirectly |
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directly |
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inversely |
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not |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
Which of the following is not a purpose of a resistor in an electrical circuit?
moderate the heat in the circuit |
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multiply the current in the circuit |
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control the voltage in the circuit |
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limit the current in the circuit |
Resistors can be chosen in a wide variety of values to control the voltage in a circuit, limit the current, or moderate the heat produced by the components in the circuit.
The volt is a unit of measurement for:
capacitance |
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voltage |
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power |
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current |
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
A solid state device has which of the following characteristics?
made entirely from conductive material |
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made from a mix of conductive and insulative material |
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made entirely from insulative material |
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made entirely from semiconductor material |
The transistor is the foundation of modern electronic devices. It is made entirely from semiconductor material (making it a solid state device) and can serve many different functions in a circuit including acting as a switch, amplifier, or current regulator. 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?
voltage is naturally hot |
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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 |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.