ASVAB Electronics Information Practice Test 821987 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.62
Score	0%	72%

Review

The formula specifying Ohm's law is which of the following?

76% Answer Correctly

	\(V = {R \over I}\)
	V = I²R
	V = IR
	\(V = {I \over R}\)

Solution

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

Longer the electrical wires mean _______________ voltage drop.

73% Answer Correctly

	greater
	lesser
	complete
	diminishing

Solution

Electrical wires have a certain amount of resistance per foot. A longer wire means more resistance and a greater voltage drop.

3 Use Ohm's Law to calculate the value of current in this circuit if voltage is 450 volts and resistance is 60 Ω.

80% Answer Correctly

	3.75 A
	9.5 A
	7.5 A
	9 A

Solution

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

Solved for current, I = \( \frac{V}{R} \) = \( \frac{450}{60} \) = 7.5 A

4 Suppose you have 8 [9V 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

	9V 160A
	36V 80A
	72V 20A
	144V 320A

Solution

Connecting the 8 batteries in series multiplies their voltage while keeping their current the same yielding a 72V 20A configuration. Connecting the 8 batteries in parallel multiplies their current while keeping their voltage the same yielding a 9V 160A configuration. Using a series-parallel connection, 4 batteries can be connected in series and 4 can be connected in parallel resulting in a 36V 80A configuration.

5 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 30 Ω and current is 4.5 amps.

85% Answer Correctly

	45 V
	148.5 V
	136.5 V
	135 V

Solution

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

V = \( I \times R \) = \( 4.5 \times 30 \) = 135 V