Tuesday, September 2, 2014

Circuit Board Photo and Manga Reading Questions

I got a (very) small TV from Goodwill and here's the circuit board for it:

Questions from Related to Manga Reading:

Calculate how much it costs to use five common appliances that you use every day in your home for 24 hours. Please let me know the appliance, its wattage, amps and volts of each appliance and how you calculated cost. You will need to go to GRU or look at one of your electric bills.

Microwave: 1.5 kW, 120 V, 12.5 A, 36 kWh (24 hrs)
Coffee Maker: 625 W, 5.3 A, 120 V (A from label), 15 kWh
iHome Lamp: 75 W, 120 V, 0.625 A, 1.8 kWh
XBOX: 120W, 12V, 9.6A (A from label), 2.88 kWh
Bread Machine: 800 W, 120 V, 6.7 A, 19.2 kWh

Total kWh for 5 appliances: 74.88 kWh
According to GRU: Energy Use, first 250 kWh .................... $0.039/kWh

Price: $2.92

How many of those appliances can you plug into one outlet without tripping a breaker? Please do this 
mathematically rather than through direct experience.
If the maximum current value is 20 A like the example in the Manga reading, then the first three appliances could be plugged in without tripping the breaker.


What is the directional relationship between charge and current?
They have an opposite relationship.


No comments:

Post a Comment