A direct-current (DC) ventilation blower operates on a 28\text{ V} aircraft electrical bus… — Armed Services Vocational Aptitude Battery (ASVAB)

A direct-current (DC) ventilation blower operates on a $28\text{ V}$ aircraft electrical bus and draws a steady current of $5\text{ A}$ . How many watts ( $\text{W}$ ) of electrical power are consumed by the blower?

Answer: 140 W

Answer

The power consumed by the blower is

140\text{ W}

According to Watt's Law, electrical power (

P

) dissipated by a direct-current device equals the product of the applied voltage (

V

) and the current (

I

). Multiplying

28\text{ V}

5\text{ A}

gives

140\text{ W}

Step-by-Step Solution

Identify the known electrical quantities given in the scenario.

Voltage

V = 28\text{ V}

and Current

I = 5\text{ A}

Identifying the known parameters determines which form of Watt's Law to use.

Apply the fundamental Watt's Law formula for electrical power (

P = V \times I

P = 28\text{ V} \times 5\text{ A} = 140\text{ W}

Electrical power in a direct-current circuit is calculated by multiplying the potential difference across the load by the current flowing through it.

Key Concept

Watt's Law for DC Power (

P = V \times I

)

Estimated Time:45s

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