ASVAB Electronics Information Practice Test 660187 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.44
Score	0%	69%

Review

The joule is a unit of measurement for:

67% Answer Correctly

	resistance
	capacitance
	power
	energy

Solution

The joule is a unit of measurement for energy.

Alternating current changes __________ many times each second.

72% Answer Correctly

	direction
	frequency
	period
	resistance

Solution

In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.

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

68% Answer Correctly

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

4 Use Ohm's Law to calculate the value of current in this circuit if voltage is 90 volts and resistance is 60 Ω.

82% Answer Correctly

	-4.5 A
	1.5 A
	1.65 A
	4.5 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 = \( \frac{V}{R} \) = \( \frac{90}{60} \) = 1.5 A

A transistor works by allowing a small amount of current to control general current flow. Where is the small amount of current applied?

55% Answer Correctly

	input
	base
	collector
	emitter

Solution

The transistor is the foundation of modern electronic devices. It is made entirely from semiconductor material (making it a solid state device) and can serve many different functions in a circuit including acting as a switch, amplifier, or current regulator. A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.