ASVAB Electronics Information Practice Test 596084 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.25
Score	0%	65%

Review

1 Use Ohm's Law to calculate the value of current in this circuit if voltage is 105 volts and resistance is 70 Ω.

81% Answer Correctly

	0.5 A
	1.5 A
	4.5 A
	0.75 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 = \( \frac{V}{R} \) = \( \frac{105}{70} \) = 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

	collector
	base
	input
	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.

Which of the following is a difference between a circuit breaker and a fuse?

80% Answer Correctly

	a circuit breaker can be reused
	a fuse responds more quickly than a circuit breaker
	all of these
	a fuse is cheaper than a circuit breaker

Solution

Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.

The joule is a unit of measurement for:

67% Answer Correctly

	power
	energy
	capacitance
	resistance

Solution

The joule is a unit of measurement for energy.

In an electronic circuit, a thermocouple can be used to:

42% Answer Correctly

	keep the circuit at a designated safe temperature
	increase or decrease the temperature of a component in the circuit
	link the temperature of one component in the circuit to that of another component in the circuit
	open or close a circuit at a designated temperature

Solution

A thermocouple is a temperature sensor that consists of two wires made from different conductors. The junction of these two wires produces a voltage based on the temperature difference between them and can be used like a switch to open or close the circuit at a designated temperature.