| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.53 |
| Score | 0% | 71% |
The hertz is a unit of measurement for:
frequency |
|
inductance |
|
power |
|
energy |
The hertz is a unit of measurement for frequency.
You would measure the amount of resistance at a certain point in a circuit with a(n):
ohmmeter |
|
ammeter |
|
potentiometer |
|
voltmeter |
Resistance is opposition to the flow of current and is measured in ohms (Ω). An ohmmeter is used to measure the amount of resistance at a certain point in a circuit.
The ampere is a unit of measurement for:
current |
|
energy |
|
inductance |
|
power |
Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.
In electrical wiring, which of the following are proportional?
the diameter of the wire and the amount of the current |
|
the length of the wire and the amount of the voltage |
|
the length of the wire and the amount of the current |
|
the diameter of the wire and the amount of the voltage |
Current flow through a wire increases the temperature of the wire. If too small a wire is used, the wire will heat up causing a loss in conductivity and possibly a fire. The thicker in diameter a wire is, the more current it can carry without overheating.
Voltage and current are __________ proportional.
directly |
|
inversely |
|
not |
|
indirectly |
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.