ASVAB Electronics Information Practice Test 921674 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.27
Score	0%	65%

Review

Resistance is opposition to which of the following?

70% Answer Correctly

	impedance
	conductance
	voltage
	current

Solution

Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.

What is the voltage of most household electrical systems in the United States?

59% Answer Correctly

	110V
	60Hz
	60V
	220V

Solution

Most households use electricity with a voltage of 110V.

The valence shell of n insulator is how full of electrons?

56% Answer Correctly

	more than half full
	empty
	less than half full
	half full

Solution

Insulators have valence shells that are more than half full of electrons and, as such, are tightly bound to the nucleus and difficult to move from one atom to another.

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

62% Answer Correctly

	negative, positive
	positive, positive
	positive, negative
	negative, 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.

5 Use Ohm's Law to calculate the value of current in this circuit if voltage is 585 volts and resistance is 90 Ω.

80% Answer Correctly

	13 A
	13.5 A
	9.5 A
	6.5 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 = \( \frac{V}{R} \) = \( \frac{585}{90} \) = 6.5 A