| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.48 |
| Score | 0% | 70% |
This circuit component symbol represents a(n):
transistor |
|
AC source |
|
DC 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.
Electrons will flow as current from areas of __________ potential (concentration of electrons) to areas of __________ potential.
low, high |
|
high, low |
|
low, low |
|
high, high |
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.
| 11.25 A | |
| 5.5 A | |
| 9.5 A | |
| 7.5 A |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for current, I = \( \frac{V}{R} \) = \( \frac{525}{70} \) = 7.5 A
From what energy do photovoltaic cells produce electrical energy?
sun |
|
magnetic |
|
chemical |
|
nuclear |
A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.
The most common circuit configuration is:
household |
|
parallel |
|
series-parallel |
|
series |
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.