| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.75 |
| Score | 0% | 75% |
Using a fuse with a current rating higher than that required by a circuit:
is required |
|
makes no difference |
|
is recommended |
|
makes the circuit less safe |
A fuse is a type of low resistance resistor that stops current flow in a circuit in response to a larger than intended electric current flow. Using a fuse with a higher current rating than required by a circuit is less safe as it could potentially allow overcurrent and risk a fire or heat-related equipment damage.
You would measure the amount of voltage between two points in a circuit with a(n):
voltmeter |
|
battery |
|
ammeter |
|
reostat |
Voltage (V) is the electrical potential difference between two points. A voltmeter is used to measure the voltage between two points in a circuit.
A __________ electric current produces a magnetic field proportional to the amount of current flow.
low voltage |
|
moving |
|
stationary |
|
high voltage |
A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.
Which of these materials is not a good conductor of electricity?
air |
|
gold |
|
copper |
|
tin |
All conductors have resistance and the amount of resistance varies with the element. In general, metals make the best conductors of electricity and non-metals make the worst conductors of electricity.
| 22 Ω | |
| 20 Ω | |
| 15 Ω | |
| 28 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 = \( \frac{V}{I} \) = \( \frac{150}{7.5} \) = 20 Ω