ASVAB Electronics Information Practice Test 458265 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.17
Score	0%	63%

Review

Silver and gold are among the most highly conductive elements. Why is copper used much more often as a conductor in electrical circuits?

80% Answer Correctly

	silver and gold are brittle
	copper is durable and relatively cheap
	silver and gold are costly
	all of these

Solution

All conductors have resistance and the amount of resistance varies with the element. But, resistance isn't the only consideration when choosing a conductor as the most highly conductive elements like silver and gold are also more expensive and more brittle than slightly less conductive elements like copper. A balance needs to be struck between the electrical qualities of a material and its cost and durability.

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

	increases
	eliminates
	does nothing to
	decreases

Solution

All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.

The ampere is a unit of measurement for:

79% Answer Correctly

	energy
	current
	power
	inductance

Solution

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.

The valence shell of n insulator is how full of electrons?

56% Answer Correctly

	less than half full
	more than half full
	empty
	half full

Solution

Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.

The valence shell of a conductor is how full of electrons?

52% Answer Correctly

	less than half full
	full
	more than half full
	half full

Solution

Conductors are elements that allow electrons to flow freely. Their valence shell is less than half full of electrons that are able to move easily from one atom to another.