Please answer 69 and 78 69. A hair dryer consumes 1750 W when connected to a 120

Question

Please answer 69 and 78

69. A hair dryer consumes 1750 W when connected to a 120 V source. A) Find the current in the hair dryer. B) How much energy is consumed if the hair dryer runs for 10 min? 78. A 25 nF capacitor is connected in series with a 1.45 MD resistor, which is connected across a 24.0 V battery. The capacitor is intially uncharged. A) What is the maximum charge the capacitor will eventually attain? B) How much time does it take the capacitor to reach 90% of its maximum charge? C) What is the time constant for this set up?

Explanation / Answer

69. Part A

Power is given by:

P = V*i

i = P/V

i = 1750/120 = 14.58 Amp

Part B

Energy = power*time

time = 10 min = 600 sec

E = 1750*600 = 1.05*10^6 J

Please Upvote.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.