ASVAB Electronics Information Practice Test 440830 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.70
Score	0%	74%

Review

A capacitor is often used for which of the following purposes?

68% Answer Correctly

	to maintain power in a circuit when the primary power source is disconnected
	to convert alternating current into direct current
	as a primary power source
	to allow a small amount of current to control a large amount of current

Solution

Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.

2 Use Ohm's Law to calculate the value of resistance in this circuit if voltage is 285 volts and current is 9.5 amps.

80% Answer Correctly

	35 Ω
	33 Ω
	15 Ω
	30 Ω

Solution

Ohm's law specifies the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit: V = IR.

Solved for resistance, R = \( \frac{V}{I} \) = \( \frac{285}{9.5} \) = 30 Ω

3 Use Ohm's Law to calculate the value of current in this circuit if voltage is 135 volts and resistance is 30 Ω.

81% Answer Correctly

	4.05 A
	1.5 A
	6.5 A
	4.5 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 = \( \frac{V}{R} \) = \( \frac{135}{30} \) = 4.5 A

Which of the following is the formula for calculating electrical power?

73% Answer Correctly

	\(P = {V \over I}\)
	P = IV
	P = I²V
	\(P = {I \over V}\)

Solution

Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.

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

69% Answer Correctly

	battery
	potentiometer
	ammeter
	voltmeter

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.