| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.41 |
| Score | 0% | 68% |
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 converts a DC input to AC while an inverter converts an AC input to DC |
|
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 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.
A __________ electric current produces a magnetic field proportional to the amount of current flow.
stationary |
|
high voltage |
|
moving |
|
low voltage |
A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.
Which of the following is a difference between a circuit breaker and a fuse?
a circuit breaker can be reused |
|
all of these |
|
a fuse responds more quickly than a circuit breaker |
|
a fuse is cheaper than a circuit breaker |
Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.
This circuit component symbol represents a(n):
capacitor |
|
inductor |
|
diode |
|
transistor |
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.
Resistance and current are __________ proportional.
directly |
|
not |
|
inversely |
|
exponentially |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.