ASVAB Electronics Information Practice Test 440555 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.69
Score	0%	74%

Review

From what energy do photovoltaic cells produce electrical energy?

68% Answer Correctly

	chemical
	nuclear
	magnetic
	sun

Solution

A photovoltaic cell (also known as a solar cell) converts energy from the sun into electrical energy.

2 Use Ohm's Law to calculate the value of current in this circuit if voltage is 630 volts and resistance is 90 Ω.

81% Answer Correctly

	7.7 A
	8.5 A
	7 A
	9 A

Solution

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

Solved for current, I = \( \frac{V}{R} \) = \( \frac{630}{90} \) = 7 A

3 What's the overall power consumption of a piece of equipment that is rated for 7 amps at 90 volts?

80% Answer Correctly

	315 W
	945 W
	630 W
	693 W

Solution

Power is measured in watts (W) and 1 watt equals 1 ampere multiplied by 1 volt: P = \( V \times I \). For this problem, the equipment is rated for 7 amps (I) at 90 volts (V) so the equation becomes P = \( 90 \times 7 \) = 630 W

Which of the following will increase the magnetic field produced by the electric current in a wire?

68% Answer Correctly

	wind the wire into a coil
	construct the wire from conductive material
	construct the wire from insulative material
	wrap the wire around a ceramic core

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.

Capacitors store:

68% Answer Correctly

	current
	capacitance
	resistance
	electricity

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.