ch. 7, 8, 9. ch. 7 electricity electricity electric charge positive and negatives conductors and...

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


V/R)

Voltage Difference is the force that causes electric charges to flow

Ch. 7 Electricity

ElectricityElectric Current


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




IV])


Current



Measured in Ohms

Resistance



Measured in Ohms




IV])


Current



Measured in Amps

Follows a circuit (closed path)

Parallel or Series Circuits

Resistance



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 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 When electric current travels through

a wire a magnetic field forms. Notice the change in direction. Why?


a wire a magnetic field forms. By forming many loops why is the magnetic field increased?


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.

ch. 7, 8, 9. ch. 7 electricity electricity electric charge positive and negatives conductors and...

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