| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.17 |
| Score | 0% | 63% |
The rate of flow of electrons per unit time is which of the following?
conductance |
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resistance |
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current |
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voltage |
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.
Which of the following statements about electrical resistance is true?
the more resistive the conductor is the faster electron flow will be |
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the less resistive the conductor is the slower electron flow will be |
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the more resistive the conductor is the slower electron flow will be |
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electrically conductive materials have no resistive properties |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
This circuit component symbol represents a(n):
transformer |
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fuse |
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potentiometer |
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inductor |
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.
A transistor to an electronic circuit is like a _______________ to a house?
safe |
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no trespassing sign |
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gate |
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driveway |
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.
Inductance is a factor in which of the following?
determining energy stored by a capacitor |
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a DC circuit |
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an AC circuit |
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batteries connected in serial |
Inductance is a property of an AC circuit (or a component in an AC circuit) that quantifies resistance to changes in current. The current in an AC circuit is continuously changing and inductive reactance (the opposition to change) depends both on the inductance of the circuit or component and the rate at which the current is changing.