Post on 17-Jan-2016
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: