ASVAB Electronics Information Practice Test 312954 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.61
Score	0%	72%

Review

1 A circuit with a 120-volt power supply is protected by a 10-amp circuit breaker. What is the largest number of watts loads on this circuit can safely use?

82% Answer Correctly

	1200 W
	1800 W
	1209 W
	400 W

Solution

Wattage is current multiplied by voltage: W = IV. So, the maximum amount of power a 120-volt circuit with a 10A circuit breaker would allow is 120V x 10A = 1200 W.

In an electrical circuit, resistors have fixed or __________ resistance.

70% Answer Correctly

	parallel
	series
	variable
	dynamic

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.

Which of the following statements about electrical resistance is true?

74% Answer Correctly

	the less resistive the conductor is the slower electron flow will be
	electrically conductive materials have no resistive properties
	the more resistive the conductor is the faster electron flow will be
	the more resistive the conductor is the slower electron flow will be

Solution

Resistance is opposition to the flow of current. As resistance increases, current decreases as resistance and current are inversely proportional.

Which of the following is a difference between a circuit breaker and a fuse?

80% Answer Correctly

	a circuit breaker can be reused
	all of these
	a fuse is cheaper than a circuit breaker
	a fuse responds more quickly than a circuit breaker

Solution

Like fuses, circuit breakers stop current flow once it reaches a certain amount. They have the advantage of being reusable (fuses must be replaced when "blown") but respond more slowly to current surges and are more expensive than fuses.

The sum of the voltage drops across each resistor in a __________ circuit will equal the total voltage applied to the circuit.

54% Answer Correctly

	series-parallel
	series
	closed
	parallel

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.