ASVAB Electronics Information Practice Test 300451 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.31
Score	0%	66%

Review

Electrons will flow as current from areas of __________ potential (concentration of electrons) to areas of __________ potential.

75% Answer Correctly

	low, low
	high, low
	high, high
	low, high

Solution

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.

The formula specifying Ohm's law is which of the following?

77% Answer Correctly

	\(V = {R \over I}\)
	\(V = {I \over R}\)
	V = IR
	V = I²R

Solution

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

What kind of diode allows current to flow in the opposite direction once a certain voltage threshold is reached?

51% Answer Correctly

	standard diode
	v-type diode
	light emitting diode
	zener diode

Solution

A diode allows current to pass easily in one direction and blocks current in the other direction. A zener diode is a diode which allows current to flow in one direction as normal and will also allow current flow in the reverse direction when the voltage is above a certain value. This value is called the breakdown voltage.

In electrical wiring, which of the following are proportional?

49% Answer Correctly

	the diameter of the wire and the amount of the voltage
	the diameter of the wire and the amount of the current
	the length of the wire and the amount of the current
	the length of the wire and the amount of the voltage

Solution

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.

5 Use Ohm's Law to calculate the value of current in this circuit if voltage is 75 volts and resistance is 10 Ω.

81% Answer Correctly

	22.5 A
	15 A
	7.5 A
	9 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 = \( \frac{V}{R} \) = \( \frac{75}{10} \) = 7.5 A