ASVAB Electronics Information Practice Test 921499 Results

Your Results Global Average
Questions 5 5
Correct 0 3.66
Score 0% 73%

Review

1

Direct current flows from the __________ terminal of the voltage source to the __________ terminal.

62% Answer Correctly

negative, negative

positive, positive

negative, positive

positive, negative
Solution

Direct current flows in only one direction in a circuit, from the negative terminal of the voltage source to the positive. A common source of direct current (DC) is a battery.

2

The rate of flow of electrons per unit time is which of the following?

74% Answer Correctly

resistance

current

voltage

conductance
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.

3

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

70% Answer Correctly

control the voltage in the circuit

multiply the current in the circuit

moderate the heat in the circuit

limit 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.

4

The ampere is a unit of measurement for:

79% Answer Correctly

current

power

inductance

energy
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.

5

Silver and gold are among the most highly conductive elements. Why is copper used much more often as a conductor in electrical circuits?

80% Answer Correctly

silver and gold are brittle

copper is durable and relatively cheap

silver and gold are costly

all of these
Solution

All conductors have resistance and the amount of resistance varies with the element.  But, resistance isn't the only consideration when choosing a conductor as the most highly conductive elements like silver and gold are also more expensive and more brittle than slightly less conductive elements like copper. A balance needs to be struck between the electrical qualities of a material and its cost and durability.