ASVAB Electronics Information Practice Test 694308 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.33
Score	0%	67%

Review

Why is an insulator a poor conductor of electricity?

68% Answer Correctly

	an insulator has few free electrons
	an insulator is made of inorganic material
	an insulator has many free electrons
	an insulator is made of organic material

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.

2 What's the overall power consumption of a piece of equipment that is rated for 2 amps at 70 volts?

80% Answer Correctly

	140 W
	139 W
	126 W
	70 W

Solution

Power is measured in watts (W) and 1 watt equals 1 ampere multiplied by 1 volt: P = \( V \times I \). For this problem, the equipment is rated for 2 amps (I) at 70 volts (V) so the equation becomes P = \( 70 \times 2 \) = 140 W

A capacitor is often used for which of the following purposes?

68% Answer Correctly

	as a primary power source
	to allow a small amount of current to control a large amount of current
	to maintain power in a circuit when the primary power source is disconnected
	to convert alternating current into direct current

Solution

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.

The most common circuit configuration is:

58% Answer Correctly

	series-parallel
	series
	household
	parallel

Solution

Circuits are not limited to only series or only parallel configurations. Most circuits contain a mix of series and parallel segments. A good example is a household circuit breaker. Electrical outlets in each section of the house are wired in parallel with the circuit breaker for that section wired in series making it easy to cut off electricity to the parallel parts of the circuit when needed.

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

	does nothing to
	increases
	eliminates
	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.