ASVAB Electronics Information Practice Test 39964 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.68
Score	0%	74%

Review

1 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 70 Ω and current is 3.5 amps.

85% Answer Correctly

	735 V
	245 V
	220.5 V
	81.67 V

Solution

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

V = \( I \times R \) = \( 3.5 \times 70 \) = 245 V

Which of the following is not a terminal on a transistor?

59% Answer Correctly

	collector
	emitter
	input
	base

Solution

A transistor works by allowing a small amount of current applied at the base to control general current flow from collector to emitter through the transistor.

A capacitor is often used for which of the following purposes?

68% Answer Correctly

	as a primary power source
	to allow a small amount of current to control a large amount of current
	to convert alternating current into direct current
	to maintain power in a circuit when the primary power source is disconnected

Solution

Capacitors store electricity and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.

4 Use Ohm's Law to calculate the value of resistance in this circuit if voltage is 255 volts and current is 8.5 amps.

80% Answer Correctly

	30 Ω
	33 Ω
	31.5 Ω
	45 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 = \( \frac{V}{I} \) = \( \frac{255}{8.5} \) = 30 Ω

Electrons will flow as current from areas of __________ potential (concentration of electrons) to areas of __________ potential.

75% Answer Correctly

	high, low
	low, low
	high, high
	low, high

Solution

Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.