ASVAB Electronics Information Practice Test 459128 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.57
Score	0%	71%

Review

1 Use Ohm's Law to calculate the value of current in this circuit if voltage is 280 volts and resistance is 70 Ω.

81% Answer Correctly

	4 A
	-1 A
	6 A
	3.6 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 = \( \frac{V}{R} \) = \( \frac{280}{70} \) = 4 A

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

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.

A solid state device has which of the following characteristics?

53% Answer Correctly

	made entirely from insulative material
	made from a mix of conductive and insulative material
	made entirely from conductive material
	made entirely from semiconductor material

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.

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

74% Answer Correctly

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

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.

From what energy do photovoltaic cells produce electrical energy?

68% Answer Correctly

	nuclear
	sun
	magnetic
	chemical

Solution

A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.