contestada

A refrigerator has a power of 90 w and is left on for 24 hours. A hair dryer has a power of 900 w an is on for 20 minutes. Which statement correctly compares the energy used by these devices

Respuesta :

skyluke89

The refrigerator has consumed more energy

Explanation:

The relationship between power and energy consumed by a device is given by

[tex]E=Pt[/tex]

where

E is the energy

P is the power

t is the time elapsed

For the refrigerator, we have

P = 90 W

[tex]t = 24 h \cdot 3600 = 86400 s[/tex]

Therefore the energy consumed is

[tex]E=(90)(86400)=7.78\cdot 10^6 J[/tex]

For the hair dryer, we have

P = 900 W

[tex]t = 20 min \cdot 60 = 1200 s[/tex]

Therefore the energy consumed is

[tex]E=(900)(1200)=1.08\cdot 10^6 J[/tex]

Therefore, the refrigerator has consumed more energy.

Learn more about power:

brainly.com/question/7956557

#LearnwithBrainly

Answer:

The refrigerator uses 6,696,000 J more than the hair dryer.

I just took the quiz and it was correct

Explanation:

Otras preguntas