| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
Which of the following allows current to pass easily in one direction and blocks current in the other direction?
resistor |
|
inductor |
|
diode |
|
capacitor |
A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.
This circuit component symbol represents a(n):
AC source |
|
DC source |
|
transistor |
|
transformer |
In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.
Voltage and current are __________ proportional.
directly |
|
not |
|
inversely |
|
indirectly |
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 statements about electrical resistance is true?
electrically conductive materials have no resistive properties |
|
the more resistive the conductor is the faster electron flow will be |
|
the more resistive the conductor is the slower electron flow will be |
|
the less resistive the conductor is the slower electron flow will be |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
What is the primary difference between a rectifier and an inverter?
a rectifier strips out the AC portion of electricity while an inverter strips out the DC portion |
|
a rectifier strips out the DC portion of electricity while an inverter strips out the AC portion |
|
a rectifier converts an AC input to DC while an inverter converts a DC input to AC |
|
a rectifier converts a DC input to AC while an inverter converts an AC input to DC |
A diode allows current to pass easily in one direction and blocks current in the other direction. Diodes are commonly used for rectification which is the conversion of alternating current (AC) into direct current (DC). Because a diode only allows current flow in one direction, it will pass either the upper or lower half of AC waves (half-wave rectification) creating pulsating DC. Multiple diodes can be connected together to utilize both halves of the AC signal in full-wave rectification.