| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.24 |
| Score | 0% | 65% |
What is the voltage of most household electrical systems in the United States?
60V |
|
60Hz |
|
220V |
|
110V |
Most households use electricity with a voltage of 110V.
Resistance and current are __________ proportional.
not |
|
inversely |
|
directly |
|
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.
Which of the following is not a terminal on a transistor?
collector |
|
input |
|
emitter |
|
base |
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.
Which of the following is a difference between a circuit breaker and a fuse?
all of these |
|
a circuit breaker can be reused |
|
a fuse is cheaper than a circuit breaker |
|
a fuse responds more quickly 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.
The most common circuit configuration is:
series-parallel |
|
series |
|
parallel |
|
household |
Circuits are not limited to only series or only parallel configurations. Most circuits contain a mix of series and parallel segments. A good example is a household circuit breaker. Electrical outlets in each section of the house are wired in parallel with the circuit breaker for that section wired in series making it easy to cut off electricity to the parallel parts of the circuit when needed.