| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.70 |
| Score | 0% | 74% |
Which of the following is a difference between a circuit breaker and a fuse?
a fuse is cheaper than a circuit breaker |
|
a circuit breaker can be reused |
|
a fuse responds more quickly than a circuit breaker |
|
all of these |
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.
A diode to an electronic circuit is like a _______________ to a city?
parking lot |
|
highway |
|
traffic light |
|
one-way street |
A diode allows current to pass easily in one direction and blocks current in the other direction.
Which of these materials is not a good conductor of electricity?
copper |
|
gold |
|
tin |
|
air |
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.
The formula specifying Ohm's law is which of the following?
\(V = {I \over R}\) |
|
\(V = {R \over I}\) |
|
V = I2R |
|
V = IR |
Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.
Resistance and current are __________ proportional.
exponentially |
|
not |
|
directly |
|
inversely |
Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.