| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.12 |
| Score | 0% | 62% |
Longer the electrical wires mean _______________ voltage drop.
complete |
|
lesser |
|
greater |
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diminishing |
Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.
Why does current in an electric circuit create heat?
the wire in the circuit burns when current passes through |
|
heat is created when the current overcomes resistance in the wire |
|
current is naturally hot |
|
voltage is naturally hot |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.
Inductance is a factor in which of the following?
batteries connected in serial |
|
an AC circuit |
|
a DC circuit |
|
determining energy stored by a capacitor |
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.
In metals, increasing the temperature typically _____________ conductivity.
decreases |
|
eliminates |
|
increases |
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does nothing to |
All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.
The valence shell of a semiconductor is how full of electrons?
less than half full |
|
empty |
|
more than half full |
|
half full |
Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.