| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.22 |
| Score | 0% | 64% |
Alternating current changes __________ many times each second.
direction |
|
resistance |
|
period |
|
frequency |
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.
What is the voltage of most household electrical systems in the United States?
60Hz |
|
60V |
|
110V |
|
220V |
Most households use electricity with a voltage of 110V.
| 72V 150A | |
| 36V 75A | |
| 72V 25A | |
| 12V 150A |
Connecting the 6 batteries in series multiplies their voltage while keeping their current the same yielding a 72V 25A configuration. Connecting the 6 batteries in parallel multiplies their current while keeping their voltage the same yielding a 12V 150A configuration. Using a series-parallel connection, 3 batteries can be connected in series and 3 can be connected in parallel resulting in a 36V 75A configuration.
This circuit component symbol represents a(n):
transistor |
|
DC source |
|
AC source |
|
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.
Which of the following is a difference between a circuit breaker and a fuse?
a circuit breaker can be reused |
|
a fuse is cheaper than a circuit breaker |
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all of these |
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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.