| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.39 |
| Score | 0% | 68% |
Which of the following will help to prevent a short circuit?
transistor |
|
fuse |
|
resistor |
|
diode |
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.
| 150 Ω | |
| 110 Ω | |
| 101.5 Ω | |
| 100 Ω |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Solved for resistance, R = \( \frac{V}{I} \) = \( \frac{450}{4.5} \) = 100 Ω
An amplifier is most similar in function to which of the following:
step-down transformer |
|
transistor |
|
capacitor |
|
step-up transformer |
An amplifier is a device that takes a small input signal and creates a larger output signal. This makes it most similar to a step-up transformer which takes a smaller input voltage and creates a larger output voltage.
What is the voltage of most household electrical systems in the United States?
110V |
|
60Hz |
|
60V |
|
220V |
Most households use electricity with a voltage of 110V.
If an electrical circuit is interrupted, which of the following will result?
short circuit |
|
closed circuit |
|
open circuit |
|
parallel circuit |
A closed circuit is a complete loop or path that electricity follows. It consists of a source of voltage, a load, and connective conductors. If the circuit is interrupted, if a wire is disconnected or cut for example, it becomes an open circuit and no electricity will flow.