An aircraft landing light is connected to a 28\text{ V} DC bus and draws a current of 4\te… — Armed Services Vocational Aptitude Battery (ASVAB)

An aircraft landing light is connected to a $28\text{ V}$ DC bus and draws a current of $4\text{ A}$ . What is the total electrical power consumed by the light?

A
$7\text{ W}$
B
$32\text{ W}$
$112\text{ W}$ Answer
D
$1120\text{ W}$

Answer

112\text{ W}

According to Watt's Law, electrical power (

P

) is equal to the product of voltage (

V

) and current (

I

). Multiplying

28\text{ V}

4\text{ A}

yields

112\text{ W}

Step-by-Step Solution

Identify the given electrical values from the circuit

Voltage

V = 28\text{ V}

, Current

I = 4\text{ A}

These are the two known parameters required to calculate power directly.

Select Watt's Law power formula that relates voltage, current, and power

P = V \times I

Electrical power in watts is equal to electromotive force in volts multiplied by current in amperes.

Calculate the total power dissipation

P = 28\text{ V} \times 4\text{ A} = 112\text{ W}

Multiplying

28

4

gives the power consumption in watts.

Key Concept

Electrical Power Calculation using Watt's Law (

P = V \times I

)

Estimated Time:45s

Question

Answer

Step-by-Step Solution

Key Concept

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