Question
Which consumes more energy, a 1.2-kW hair dryer used for 10 min or a 7-W night-light left on for $24 \mathrm{~h} ?$
Step 1
Energy consumption can be calculated using the formula: Energy Consumption = Power × Time For the hair dryer: Power = 1.2 kW = 1200 W (since 1 kW = 1000 W) Time = 10 min = 10/60 h (since 1 min = 1/60 h) Energy Consumption (hair dryer) = 1200 W × (10/60) h = 200 Show more…
Show all steps
Your feedback will help us improve your experience
Vishal Gupta and 98 other Physics 101 Mechanics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Which consumes more energy, a 1.2 -k $\mathrm{W}$ hair dryer used for 10 min or a $7-W$ night-light left on for 24 h?
I Which consumes more energy, a $1.2 \mathrm{kW}$ hair dryer used for 10 min or a $10 \mathrm{W}$ night light left on for $24 \mathrm{hr} ?$
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD