ASVAB Electronics Information Practice Test 497518 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.60
Score	0%	72%

Review

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

58% Answer Correctly

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

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

68% 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.

3 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 40 Ω and current is 4.5 amps.

85% Answer Correctly

	183 V
	180 V
	540 V
	186 V

Solution

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

V = \( I \times R \) = \( 4.5 \times 40 \) = 180 V

Which of the following is a difference between a circuit breaker and a fuse?

80% Answer Correctly

	all of these
	a fuse is cheaper than a circuit breaker
	a circuit breaker can be reused
	a fuse responds more quickly than a circuit breaker

Solution

Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.

Using a fuse with a current rating higher than that required by a circuit:

70% Answer Correctly

	makes the circuit less safe
	makes no difference
	is required
	is recommended

Solution

A fuse is a type of low resistance resistor that stops current flow in a circuit in response to a larger than intended electric current flow. Using a fuse with a higher current rating than required by a circuit is less safe as it could potentially allow overcurrent and risk a fire or heat-related equipment damage.