No cheating……………..

1500 Watts 1440Watts 1200 Watts

1100 Watts 300 Watts

&

•The typical American household receives 120 Volts of electricity from the grid

•Household circuits can carry a maximum of 15 Amps of current

•What happens when there is too much current moving through the wires??

TYPICAL HOUSEHOLD CIRCUIT:(Review)

The house receives constant voltage (120 V)

Resistance transfers the electron’s KE to: Light and Heat energy

Power (in Watts) is needed to “push” electrons through the resistance

If too much current is drawn into a circuit, wires get hot

fuse blows to prevent further damage

Equations: Power = energy per

second Power = current * voltage

3 Watts 100 Watts 1200 Watts 1440 Watts

•Total Power?? =

•Plug in your values into using V=120 Volts.

•Does the Amperage exceed 15 A??

Practice:

Ex)

Blender = 800 WattsLamp = 120 WattsCoffee Maker = 600 Watts

Power = 800 + 120 + 600 = 1520 Watts

Current = 1520 Watts / 120 V = 12.67 Amps

Find an outlet in a room of your house with a few appliances plugged into it

Write down each appliance’s power (Watts) and add them together

Find out how much current is drawn from that outlet: