ASVAB Electronics Information Practice Test 851515 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.27
Score	0%	65%

Review

1 Use Ohm's Law to calculate the value of voltage in this circuit if resistance is 80 Ω and current is 5 amps.

85% Answer Correctly

	399 V
	440 V
	360 V
	400 V

Solution

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

V = \( I \times R \) = \( 5 \times 80 \) = 400 V

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

43% Answer Correctly

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

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.

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?

82% Answer Correctly

	2402 W
	7200 W
	2640 W
	2400 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.

Inductance is a factor in which of the following?

44% Answer Correctly

	a DC circuit
	determining energy stored by a capacitor
	an AC circuit
	batteries connected in serial

Solution

Inductance is a property of an AC circuit (or a component in an AC circuit) that quantifies resistance to changes in current. The current in an AC circuit is continuously changing and inductive reactance (the opposition to change) depends both on the inductance of the circuit or component and the rate at which the current is changing.

Electricity cannot flow...

72% Answer Correctly

	through a circuit with resistance
	through an open circuit
	through a closed circuit
	through a circuit under load

Solution

An electrical circuit is a path through which electricity flows. This path contains one or more components that create a load (something that is using electricity) and that load acts as resistance to the passage of electricity through the circuit. Electricity can only flow through a circuit when the path is closed and cannot flow through an open circuit.