ASVAB Electronics Information Practice Test 936123 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.26
Score	0%	65%

Review

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

68% Answer Correctly

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

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.

Which of the following is not a purpose of a resistor in an electrical circuit?

70% Answer Correctly

	moderate the heat in the circuit
	limit the current in the circuit
	control the voltage in the circuit
	multiply the current in the circuit

Solution

Resistors can be chosen in a wide variety of values to control the voltage in a circuit, limit the current, or moderate the heat produced by the components in the circuit.

3 Use Ohm's Law to calculate the value of resistance in this circuit if voltage is 540 volts and current is 6 amps.

80% Answer Correctly

	90 Ω
	45 Ω
	92 Ω
	135 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 = \( \frac{V}{I} \) = \( \frac{540}{6} \) = 90 Ω

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

56% Answer Correctly

	less than half full
	empty
	half full
	more than 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.

5 How would you connect 4 [9V 5A] batteries to achieve a combined power output of 36V 5A?

53% Answer Correctly

	series-parallel
	perpendicular
	series
	parallel

Solution

Connecting the 4 batteries in series multiplies their voltage while keeping their current the same yielding a 36V 5A configuration. Connecting the 4 batteries in parallel multiplies their current while keeping their voltage the same yieleding a 9V 20A configuration. Using a series-parallel connection, 2 batteries can be connected in series and 2 can be connected in parallel resulting in a 18V 10A configuration.