ASVAB Electronics Information Practice Test 773774 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.50
Score	0%	70%

Review

Which of the following statements about a capacitor is false?

77% Answer Correctly

	it is safe to touch a capacitor with your hands as long as it is small
	you should always discharge any capacitors before working on an electronic circuit
	a capacitor remains charged even after the input voltage is removed
	to discharge a capacitor safely, use a high-wattage resistor comparable to the capacitance of the capacitor

Solution

The purpose of a capacitor is to retain electric charge and it will do so even after its input voltage is removed. After the input voltage is removed, the capacitor will slowly discharge but, depending on the size and characteristics of the capacitor, discharging could take from a few minutes to a few years. So, it's never safe to touch a capacitor with your hands and you should make sure to discharge any capacitors in a circuit before working on it using an appropriately high-wattage resistor or a capacitor discharge tool.

Resistance is opposition to which of the following?

70% Answer Correctly

	impedance
	current
	voltage
	conductance

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.

Resistance is measured in:

86% Answer Correctly

	amperes
	volts
	coulombs
	ohms

Solution

Current is the rate of flow of electrons per unit time and is measured in:

69% Answer Correctly

	amperes
	volts
	coulombs
	ohms

Solution

Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

	decreases
	increases
	does nothing to
	eliminates

Solution

All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.