ASVAB Electronics Information Practice Test 868317 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.57
Score	0%	71%

Review

1 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 80 Ω and current is 7.5 amps.

85% Answer Correctly

	608 V
	600 V
	599 V
	602 V

Solution

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

V = \( I \times R \) = \( 7.5 \times 80 \) = 600 V

A __________ electric current produces a magnetic field proportional to the amount of current flow.

60% Answer Correctly

	moving
	low voltage
	stationary
	high voltage

Solution

A moving electric current produces a magnetic field proportional to the amount of current flow. This magnetic field can be made stronger by winding the wire into a coil and further enhanced if done around an iron containing (ferrous) core.

3 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?

85% Answer Correctly

	2400 W
	7200 W
	1200 W
	2640 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.

Which of the following can conduct electricity under some conditions but not others?

83% Answer Correctly

	semiconductor
	insulator
	conductor
	resistor

Solution

Semiconductors have valence shells that are exacly half full and can conduct electricity under some conditions but not others. This property makes them useful for the control of electrical current.

Which of the following is not true about a line drop?

43% Answer Correctly

	it is addressed by raising voltage and lowering current across the transmission line
	it is a decrease in voltage between two points on a line
	it is addressed by raising current and lowering voltage across the ransmission line
	it is caused by resistance

Solution

Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. A line drop is a decrease in voltage between two points on an electrical transmission line due to resistance in the line. A lower current and higher voltage across the line will help compensate for the line drop.