ASVAB Electronics Information Practice Test 223461 Results

Your Results Global Average
Questions 5 5
Correct 0 3.64
Score 0% 73%

Review

1

Which of the following is the formula for calculating electrical power?

73% Answer Correctly

\(P = {I \over V}\)

P = IV

\(P = {V \over I}\)

P = I2V


Solution

Electrical power is measured in watts (W) and is calculated by multiplying the voltage (V) applied to a circuit by the resulting current (I) that flows in the circuit: P = IV. In addition to measuring production capacity, power also measures the rate of energy consumption and many loads are rated for their consumption capacity. For example, a 60W lightbulb utilizes 60W of energy to produce the equivalent of 60W of heat and light energy.


2

Why is an insulator a poor conductor of electricity?

68% Answer Correctly

an insulator is made of organic material

an insulator has many free electrons

an insulator is made of inorganic material

an insulator has few free electrons


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.


3

If an electrical circuit is interrupted, which of the following will result?

61% Answer Correctly

closed circuit

short circuit

parallel circuit

open circuit


Solution

A closed circuit is a complete loop or path that electricity follows. It consists of a source of voltage, a load, and connective conductors. If the circuit is interrupted, if a wire is disconnected or cut for example, it becomes an open circuit and no electricity will flow.


4 What's the overall power consumption of a piece of equipment that is rated for 7 amps at 40 volts?
92% Answer Correctly
280 W
840 W
560 W
282 W

Solution
Power is measured in watts (W) and 1 watt equals 1 ampere multiplied by 1 volt: P = \( V \times I \). For this problem, the equipment is rated for 7 amps (I) at 40 volts (V) so the equation becomes P = \( 40 \times 7 \) = 280 W

5

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

61% Answer Correctly

high voltage

low voltage

stationary

moving


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.