Log in
Physics
1
answer
0
watching
81
views
23 Nov 2019

Which costs more, running a 1,200 W hair dryer for 3 min or leaving a 60-W lamp on overnight (1h)?

Watch
1
answer
0
watching
81
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Irving Heathcote
Irving HeathcoteLv2
7 Jul 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share

Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Which costs more, running a 1,200 W hairdryer for 3 min or leaving a 60-W lamp on overnight (1h)?

The cost of energy delivered to residences by electrical transmission varies from $0.070/kWh to $0.258/kWh throughout the United States; $0.110/kWh is the average value.

(a) At this average price, calculate the cost of leaving a 75-W porch light on for two weeks while you are on vacation?

(b) At this average price, calculate the cost of making a piece of dark toast in 3.00 min with a 960-W toaster?

(c) At this average price, calculate the cost of drying a load of clothes in 40.0 min in a 5.20 X 103 W dryer?

Figure P27.3 shows the interior of a three-way incandescent lightbulb, which provides three levels of light intensity. The socket of the lamp is equipped with a four-position switch for selecting different light intensities, with the positions described as follows: (1) off (switches S1 and S2 both open), (2) switch S1 closed, (3) switch S2 closed, and (4) switches S1 and S2 both closed. 

The lightbulb contains two filaments. When the lamp is connected to a 120-V source, one filament receives 100 W of power and the other receives 75 W. What is the total power input of the light bulb when

(a) only switch S1 is closed

(b) only switch S2 is closed

(c) both switches are closed

(d) What if? Suppose the 75-W filament breaks and no longer is able to carry a current. How many switch positions will result in the light leaving the bulb and what will be the power input to the bulb in those positions?

Weekly leaderboard

Home
Homework Help 3,900,000
Physics 110,000
Start filling in the gaps now
Log in