Help with physics test question please?
Question by Samantha: Help with physics test question please?
Also list these from highest to lowest cost to operate:
A. 1500 watt hair dryer for 10 mins.
B. 100 watt light bulb for 3 hours
C. 500 watt street light for 8 hours
D. 1000 watt microwave for 9 mins
E. 450 watt computer for 12 hours
Best answer:
Answer by dawgdays
What you want to determine is the total watt-hours for each part of the problem, and choose the highest. To do this, you multiple the wattage by the number of hours. Note that for a couple of these, the time is specified in minutes, so you have to convert those to equivalent hours. (Or I guess you could convert the hours to minutes, and calculate watt-minutes, but whatever.)
It’s probably the computer, but I haven’t done the computations, so you’ll want to double-check.
What do you think? Answer below!
