| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.34 |
| Score | 0% | 67% |
Which of the following statements about electrical resistance is true?
the more resistive the conductor is the faster electron flow will be |
|
the less resistive the conductor is the slower electron flow will be |
|
electrically conductive materials have no resistive properties |
|
the more resistive the conductor is the slower electron flow will be |
Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.
The farad is a unit of measurement for:
energy |
|
capacitance |
|
inductance |
|
power |
Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.
A __________ electric current produces a magnetic field proportional to the amount of current flow.
moving |
|
stationary |
|
low voltage |
|
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.
The conductivity of an element depends on how many electrons occupy which electron shell?
inner |
|
outer |
|
middle |
|
first |
All electricity is the movement of electrons which are subatomic particles that orbit the nucleus of an atom. Electrons occupy various energy levels called shells and how well an element enables the flow of electrons depends on how many electrons occupy its outer (valence) electron shell.
The voltage output of a transformer primarily depends on which of the following?
the diameter of the wire in the coils |
|
the conductor used for the wire in the coils |
|
the number of turns in the wire of the coils |
|
the diameter of the coils |
A transformer utilizes an inductor to increase or decrease the voltage in a circuit. AC flowing in a coil wrapped around an iron core magnetizes the core causing it to produce a magnetic field. This magnetic field generates a voltage in a nearby coil of wire and, depending on the number of turns in the wire of the primary (source) and secondary coils and their proximity, voltage is induced in the secondary coil.