Sunday, September 29, 2013

Power Estimation

Assignment: Estimate the amount of power used for typical objects: light, TV, computer, car, motorcycle, fridge, oven and radio. Document any sources you used, thought processes, calculations, etc. NO INTERNET.

Radio
Easy peasy. I looked at my radio.

18V, 1.6A
Power = Volts x Amps
Power = 18V x 1.6A
Radio Power = 28.8W

Light
Although the strength wasn't specified in the directions, I found a 60W bulb in the storage closet on my hall.
Light Power = 60W

Computer
Based on the amount of heat my old computer generates because the fan is partially broken, and the heat of a bare light bulb, I'd guess the wattage of my computer is about three bulbs.
Power = 60W x ~3 light bulbs
Computer Power = 180W

Oh wait a minute! I have a computer!
Power = Volts x Amps
Power = 19.5V x 3.34A
Computer Power = 65.13W

TV
Let's assume a 20-inch TV. My computer is 18 inches, and I think a TV would have about the same power, so with rounding I think a TV and computer are similar.
Power = 180W (Computer)
TV Power = 180W

Car- Electric
An electric car probably uses about 10,000 times the power of a light bulb.
Power = 10,000 light bulbs x 60W
Car Power = 600,000W

Motorcycle
A motorcycle is about a third of the size of a car and might use a third of the power.
Power = 600,000W / 3
Motorcycle Power = 200,000W

Fridge
My fridge is about 2' x 4' x 3', or 24 ft sq. If one light bulb energy can freeze two square feet, we'll need approximately 12 light bulbs.
Power = 60W x 10 light bulbs
Fridge Power = 720W

Oven
An Easy Bake oven takes one light bulb to cook a mini-cake. A real oven is probably 20 times hotter.
Power = 60W x 20
Oven Power = 1200W

This estimation and talk of Easy Bake ovens is making me hungry. I'm going to go use my 800W microwave to cook a snack.

1 comment:

  1. Let's hope that hot dog wasn't cooked in an Easy Bake oven!

    ReplyDelete