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lubasha [3.4K]
3 years ago
15

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. The total electrical energy used by the dryer

during this time interval is
Physics
1 answer:
Talja [164]3 years ago
5 0

Answer:

2.25\cdot 10^5 J

Explanation:

First of all, we have to find the power used by the hair dryer, which is given by

P=\frac{V^2}{R}

where

V = 120 V is the voltage

R=9.6 \Omega is the resistance of the hair dryer

Substituting,

P=\frac{(120 V)^2}{9.6 \Omega}=1500 W

Now we can find the total electrical energy used, given by

E=Pt

where P is the power and

t = 2.5 min = 150 s is the time

Substituting,

E=(1500 W)(150 s)=2.25\cdot 10^5 J

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