ASVAB Electronics Information Practice Test 63588 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.43
Score	0%	69%

Review

1 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 10 Ω and current is 1 amps.

85% Answer Correctly

	13 V
	10 V
	17 V
	3.33 V

Solution

Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.

V = \( I \times R \) = \( 1 \times 10 \) = 10 V

Which of the following allows DC to pass easily but resists the flow of AC?

56% Answer Correctly

	semiconductor
	capacitor
	transformer
	inductor

Solution

An inductor is coiled wire that stores electric energy in the form of magnetic energy and resists changes in the electric current flowing through it. If current is increasing, the inductor produces a voltage that slows the increase and, if current is decreasing, the magnetic energy in the coil opposes the decrease to keep the current flowing longer. In contrast to capacitors, inductors allow DC to pass easily but resist the flow of AC.

Which of the following will increase the magnetic field produced by the electric current in a wire?

67% Answer Correctly

	construct the wire from conductive material
	construct the wire from insulative material
	wind the wire into a coil
	wrap the wire around a ceramic core

Solution

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.

4 Use Ohm's Law to calculate the value of current in this circuit if voltage is 160 volts and resistance is 20 Ω.

80% Answer Correctly

	7.2 A
	4 A
	16 A
	8 A

Solution

Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.

Solved for current, I = \( \frac{V}{R} \) = \( \frac{160}{20} \) = 8 A

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

56% Answer Correctly

	less than half full
	half full
	more than half full
	empty

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.