ASVAB Electronics Information Practice Test 44805 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.22
Score	0%	64%

Review

You would measure the amount of current through a circuit with a(n):

68% Answer Correctly

	voltmeter
	battery
	ammeter
	potentiometer

Solution

Current is the rate of flow of electrons per unit time and is measured in amperes (A). An ammeter is used to measure the electric current in a circuit.

The voltage output of a transformer primarily depends on which of the following?

57% Answer Correctly

	the number of turns in the wire of the coils
	the conductor used for the wire in the coils
	the diameter of the coils
	the diameter of the wire in the coils

Solution

A transformer utilizes an inductor to increase or decrease the voltage in a circuit. AC flowing in a coil wrapped around an iron core magnetizes the core causing it to produce a magnetic field. This magnetic field generates a voltage in a nearby coil of wire and, depending on the number of turns in the wire of the primary (source) and secondary coils and their proximity, voltage is induced in the secondary coil.

In electrical wiring, which of the following are proportional?

50% Answer Correctly

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

4 What's the overall power consumption of a piece of equipment that is rated for 8 amps at 100 volts?

80% Answer Correctly

	805 W
	802 W
	800 W
	1600 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 8 amps (I) at 100 volts (V) so the equation becomes P = \( 100 \times 8 \) = 800 W

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
	emitter
	collector
	base

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.