ASVAB Electronics Information Practice Test 621841 Results

Your Results Global Average
Questions 5 5
Correct 0 3.41
Score 0% 68%

Review

1

From what energy do photovoltaic cells produce electrical energy?

68% Answer Correctly

nuclear

chemical

sun

magnetic
Solution

A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.

2

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

60% Answer Correctly

stationary

low voltage

high voltage

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.

3

What type of current flows in only one direction in a circuit?

82% Answer Correctly

parallel

direct

series

alternating
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.

4 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 80 Ω and current is 5 amps.
85% Answer Correctly
440 V
401.5 V
400 V
1200 V
Solution

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

V = \( I \times R \) = \( 5 \times 80 \) = 400 V

5 Suppose you have 8 [6V 20A] batteries that you can connect together in series, in parallel, or in series-parallel. Which of the following voltage and ampere combinations cannot be attained using these 8 batteries?
46% Answer Correctly
8V 120A
24V 80A
48V 20A
6V 160A
Solution

Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 48V 20A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yielding a 6V 160A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 24V 80A configuration.