ASVAB Electronics Information Practice Test 798646 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.75
Score	0%	75%

Review

1 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 10 Ω and current is 4 amps.

85% Answer Correctly

	43 V
	20 V
	40 V
	36 V

Solution

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

V = \( I \times R \) = \( 4 \times 10 \) = 40 V

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

67% Answer Correctly

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

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.

Why does current in an electric circuit create heat?

77% Answer Correctly

	the wire in the circuit burns when current passes through
	voltage is naturally hot
	heat is created when the current overcomes resistance in the wire
	current is naturally hot

Solution

Current in an electric circuit creates heat when the current overcomes resistance in the wire.

4 Use Ohm's Law to calculate the value of current in this circuit if voltage is 380 volts and resistance is 40 Ω.

80% Answer Correctly

	14.25 A
	10.45 A
	9.5 A
	11.5 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 = \( \frac{V}{R} \) = \( \frac{380}{40} \) = 9.5 A

This circuit component symbol represents a(n):

66% Answer Correctly

	DC source
	AC source
	transistor
	transformer

Solution

In contrast to the constant one-way flow of direct current, alternating current changes direction many times each second. Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances.