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ELECTRICITY AND ENERGY RESOURCES
Ch. 7, 8, 9
Ch. 7 Electricity
ElectricityElectric Charge
Positive and
Negatives
Conductors and
Insulators
Lightning
Electric
Current
Circuits, Batteries, Ohm’s Law (I =
V/R)
Electric
Energy
Ch. 7 ElectricityElectricit
yElectric Charge
Positive and
Negatives
Conductors and
InsulatorsLightning
Ch. 7 Electricity Bellringer
WRITE the question. USE your book. What kind of charged particle is
attracted to a positive charge? What is electric current made of? Define:
Voltage Resistance Insulators
Ch. 7 Electricity
ElectricityElectric Current
Circuits, Batteries, Ohm’s Law (I =
V/R)
Voltage Difference is the force that causes electric charges to flow
Ch. 7 Electricity
ElectricityElectric Current
Circuits, Batteries, Ohm’s Law (I =
V/R)
Ch. 7 ElectricityElectricity
Ohm’s Law [I = V/R]
Electrical Power [Power (watts) =
IV])
Electrical Energy [E (kWh) = Pt]
Current
A flow of negatively
charged electrons in one direction
Measured in Ohms
Follows a circuit (closed path)
Parallel or Series Circuits
Resistance
Opposes the flow of electrons resulting in
thermal energy and light
Measured in Ohms
Ch. 7 ElectricityElectricity
Ohm’s Law [I = V/R]
Electrical Power [Power (watts) =
IV])
Electrical Energy [E (kWh) = Pt]
Current
A flow of negatively
charged electrons in one direction
Measured in Ohms
Resistance
Opposes the flow of electrons resulting in
thermal energy and light
Measured in Ohms
Ch. 7 ElectricityElectricity
Ohm’s Law [I = V/R]
Electrical Power [Power (watts) =
IV])
Electrical Energy [E (kWh) = Pt]
Current
A flow of negatively
charged electrons in one direction
Measured in Amps
Follows a circuit (closed path)
Parallel or Series Circuits
Resistance
Opposes the flow of electrons resulting in
thermal energy and light
Measured in Ohms
Voltage
The force that causes electrons
to flow
Measured in Volts
Static Electricity
Build up of excess charges
on an object
A sudden discharge of negatively
charged electrons
Lightning
Problems to Solve
1. Calculate the voltage difference in a circuit with 25 ohms resistance if the current is 0.5 amps.
2. A current of 5 amps flows in a 600 watt light bulb. The voltage difference between the filament ends is 120V. What is the resistance of the filament?
Problems to Solve
3. What kind of a circuit is this?
Problems to Solve
2. What kind of a circuit is this?
Problems to Solve
5. A toaster is plugged into an outlet where the voltage is 120V. How much power does it use if the current is 10A?
6. A VCR on powersave mode (not on) still uses 10 W of power. What is the current if the VCR is plugged into 220 V?
7. A flashlight bulb uses 2.4 W of power when the current in the bulb is .8 A What is the voltage difference supplied by the battery?
Problems to Solve
8. A microwave with a power rating of 1,200 W is used for .25 h. How much electrical energy is used by the microwave?
9. A refrigerator operates for about 18 hours a day. The 700 W rating on a fridge means it uses ________ of electrical energy each day.
Ch. 8 Magnetism
Magnetic Poles
Ch. 8 Magnetism
Ch. 8 Magnetism
Ch. 8 Magnetism The magnetic flux lines up the
compass arrows along their North-South orientation
Ch. 8 Magnetism
Ch. 8 Magnetism
What happens when the current is reversed?
Ch. 8 Magnetism
Electric Motors
Ch. 8 Magnetism
Electric Motors
Ch. 8 Magnetism When electric current travels through
a wire a magnetic field forms. Notice the change in direction. Why?
Ch. 8 Magnetism When electric current travels through
a wire a magnetic field forms. By forming many loops why is the magnetic field increased?
Ch. 8 Magnetism When electric current travels through
a wire a magnetic field forms. By forming many loops why is the magnetic field increased?
http://science.howstuffworks.com/electromagnet2.htm
Ch. 8 Magnetism Successfully write and answer #1-13
p. 218 & #1-14, p. 250In groups describe how an electrical generator works. Video answers.
Ch. 8 Magnetism Remember the “Right Hand Rule” to
determine the direction of the magnetic flux caused by a current.