| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.60 |
| Score | 0% | 72% |
The hertz is a unit of measurement for:
inductance |
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energy |
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frequency |
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power |
The hertz is a unit of measurement for frequency.
A transistor works by allowing a small amount of current to control general current flow. Where is the small amount of current applied?
base |
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input |
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collector |
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emitter |
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?
heat is created when the current overcomes resistance in the wire |
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current is naturally hot |
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voltage 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.
The rate of flow of electrons per unit time is which of the following?
resistance |
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voltage |
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conductance |
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current |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.
This circuit component symbol represents a(n):
inductor |
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potentiometer |
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capacitor |
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resistor |
Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.