Power in electric circuit

1
Power in electric circuit
What are you paying for the electricity bill?
Potential energy charge in moving charge dq
Electricity bill kWhrPt
energy
Home electric appliances what does a 1000 W hair
dryer tell you?

• Always assume 120V if the voltage is not
  specified.

• Never exceed the rated power.

2
An example parallel circuit
There is a circuit break in circuit that supplies
power to your kitchen. The circuit break will be
triggered if the total current exceeds 25 A. Can
you turn on a 1500W toaster, a 1000W dishwasher,
a 1000 W microwave oven, and 1000W refrigerator
simultaneously?