| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.49 |
| Score | 0% | 70% |
Which of the following statements about electrical resistance is true?
the less resistive the conductor is the slower electron flow will be |
|
the more resistive the conductor is the faster electron flow will be |
|
the more resistive the conductor is the slower electron flow will be |
|
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.
A transistor to an electronic circuit is like a _______________ to a house?
driveway |
|
no trespassing sign |
|
safe |
|
gate |
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.
| 103 Ω | |
| 110 Ω | |
| 200 Ω | |
| 100 Ω |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for resistance, R = \( \frac{V}{I} \) = \( \frac{50}{0.5} \) = 100 Ω
Why is an insulator a poor conductor of electricity?
an insulator is made of inorganic material |
|
an insulator has few free electrons |
|
an insulator is made of organic material |
|
an insulator has many free electrons |
Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.
What is the frequency of most household electrical systems?
60MHz |
|
110Hz |
|
110V |
|
60Hz |
Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. Most households use electricity with a frequency of 60Hz.