ASVAB Electronics Information Practice Test 341987 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.40
Score	0%	68%

Review

1 Use Ohm's Law to calculate the value of resistance in this circuit if voltage is 90 volts and current is 4.5 amps.

80% Answer Correctly

	16 Ω
	22 Ω
	20 Ω
	60 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 = \( \frac{V}{I} \) = \( \frac{90}{4.5} \) = 20 Ω

Resistance is measured in:

86% Answer Correctly

	amperes
	coulombs
	volts
	ohms

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.

This circuit diagram represents a(n):

69% Answer Correctly

	series circuit
	parallel circuit
	open circuit
	series-parallel circuit

Solution

A series circuit has only one path for current to flow. In a series circuit, current (I) is the same throughout the circuit and is equal to the total voltage (V) applied to the circuit divided by the total resistance (R) of the loads in the circuit. The sum of the voltage drops across each resistor in the circuit will equal the total voltage applied to the circuit.

In metals, increasing the temperature typically _____________ conductivity.

50% Answer Correctly

	does nothing to
	decreases
	eliminates
	increases

Solution

All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.

This circuit component symbol represents a(n):

55% Answer Correctly

	transformer
	inductor
	potentiometer
	fuse

Solution

Resistors are used to limit voltage and/or current in a circuit and can have a fixed or variable resistance. Variable resistors (often called potentiometers or rheostats) are used when dynamic control over the voltage/current in a circuit is needed, for example, in a light dimmer or volume control.