ASVAB Electronics Information Practice Test 490838 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.15
Score	0%	63%

Review

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

68% Answer Correctly

	voltmeter
	potentiometer
	battery
	ammeter

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.

2 A circuit with a 120-volt power supply is protected by a 25-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?

82% Answer Correctly

	3000 W
	6000 W
	4500 W
	2700 W

Solution

Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 25A circuit breaker would allow is 120V x 25A = 3000 W.

What is the potential difference in an electrical circuit a measure of?

58% Answer Correctly

	the current at a specific location in the circuit
	the voltage at a specific location in the circuit
	the resistance at a specific location in the circuit
	the load at a specific location in the circuit

Solution

Electrons flow from an area of high concentration to an area of low concentration. A high voltage indicates a high concentration of electrons that creates a greater potential for electron flow than a low voltage. When applied to a load, voltage creates electricity and potential difference is the measure of voltage at a specific location in an electrical circuit.

A __________ electric current produces a magnetic field proportional to the amount of current flow.

61% Answer Correctly

	moving
	high voltage
	stationary
	low voltage

Solution

A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.

Inductance is a factor in which of the following?

44% Answer Correctly

	batteries connected in serial
	a DC circuit
	an AC circuit
	determining energy stored by a capacitor

Solution

Inductance is a property of an AC circuit (or a component in an AC circuit) that quantifies resistance to changes in current. The current in an AC circuit is continuously changing and inductive reactance (the opposition to change) depends both on the inductance of the circuit or component and the rate at which the current is changing.