ASVAB Electronics Information Practice Test 321617 Results

Your Results Global Average
Questions 5 5
Correct 0 3.74
Score 0% 75%

Review

1

The joule is a unit of measurement for:

67% Answer Correctly

capacitance

resistance

energy

power
Solution

The joule is a unit of measurement for energy.

2 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 20 Ω and current is 8 amps.
85% Answer Correctly
144 V
161.5 V
240 V
160 V
Solution

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

V = \( I \times R \) = \( 8 \times 20 \) = 160 V

3

Alternating current changes __________ many times each second.

72% Answer Correctly

period

direction

frequency

resistance
Solution

In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.

4

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

silver and gold are costly

all of these

copper is durable and relatively cheap
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.

5

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

70% Answer Correctly

makes no difference

is recommended

makes the circuit less safe

is required
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.