ASVAB Electronics Information Practice Test 287768 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.23
Score	0%	65%

Review

This circuit component symbol represents a(n):

55% Answer Correctly

	transformer
	fuse
	inductor
	potentiometer

Solution

Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.

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

81% Answer Correctly

	2 A
	1 A
	1.5 A
	0.5 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 = \( \frac{V}{R} \) = \( \frac{10}{10} \) = 1 A

Direct current flows from the __________ terminal of the voltage source to the __________ terminal.

62% Answer Correctly

	positive, positive
	negative, negative
	negative, positive
	positive, negative

Solution

Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of direct current (DC) is a battery.

Which of the following is not a terminal on a transistor?

59% Answer Correctly

	input
	collector
	base
	emitter

Solution

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.

This circuit component symbol represents a(n):

65% Answer Correctly

	transistor
	AC source
	transformer
	DC source

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.