| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.27 |
| Score | 0% | 65% |
What is the frequency of most household electrical systems?
110V |
|
110Hz |
|
60Hz |
|
60MHz |
Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. Most households use electricity with a frequency of 60Hz.
What is the voltage of most household electrical systems in the United States?
60V |
|
220V |
|
110V |
|
60Hz |
Most households use electricity with a voltage of 110V.
This circuit component symbol represents a(n):
diode |
|
capacitor |
|
resistor |
|
fuse |
Fuses are thin wires that melt when the current in a circuit exceeds a preset amount. They help prevent short circuits from damaging circuit components when an unusually large current is applied to the circuit, either through component failure or spikes in applied voltage.
Why does current in an electric circuit create heat?
current is naturally hot |
|
the wire in the circuit burns when current passes through |
|
heat is created when the current overcomes resistance in the wire |
|
voltage is naturally hot |
Current in an electric circuit creates heat when the current overcomes resistance in the wire.
Which of the following converts electrical energy into another form of energy in an electrical circuit?
load |
|
wiring |
|
DC source |
|
AC source |
A load is a source of resistance that converts electrical energy into another form of energy. The components of a microwave, for example, are loads that work together to convert household electricity into radation that can be used to quickly cook food.