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
Asked by maham237 @ in Physics viewed by 1173 People
Asked by maham237 @ in Physics viewed by 1173 People
Answered by maham237 @
Answer:
Explanation:
First of all, we have to find the power used by the hair dryer, which is given by
where
V = 120 V is the voltage
is the resistance of the hair dryer
Substituting,
Now we can find the total electrical energy used, given by
where P is the power and
t = 2.5 min = 150 s is the time
Substituting,
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