ASVAB Electronics Information Practice Test 521296 Results

Your Results Global Average
Questions 5 5
Correct 0 3.71
Score 0% 74%

Review

1

Resistance is opposition to which of the following?

70% Answer Correctly

current

conductance

impedance

voltage
Solution

Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.

2

Resistance is measured in:

86% Answer Correctly

amperes

ohms

volts

coulombs
Solution

Resistance is opposition to the flow of current and is measured in ohms (Ω). One ohm is defined as the amount of resistance that will allow one ampere of current to flow if one volt of voltage is applied. As resistance increases, current decreases as resistance and current are inversely proportional.

3

What kind of diode allows current to flow in the opposite direction once a certain voltage threshold is reached?

51% Answer Correctly

light emitting diode

zener diode

standard diode

v-type diode
Solution

A diode allows current to pass easily in one direction and blocks current in the other direction. A zener diode is a diode which allows current to flow in one direction as normal and will also allow current flow in the reverse direction when the voltage is above a certain value. This value is called the breakdown voltage.

4 A circuit with a 120-volt power supply is protected by a 20-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?
82% Answer Correctly
7200 W
2403 W
4800 W
2400 W
Solution
Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 20A circuit breaker would allow is 120V x 20A = 2400 W.
5 Use Ohm's Law to calculate the value of resistance in this circuit if voltage is 35 volts and current is 0.5 amps.
80% Answer Correctly
72 Ω
35 Ω
140 Ω
70 Ω
Solution

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

Solved for resistance, R = \( \frac{V}{I} \) = \( \frac{35}{0.5} \) = 70 Ω