Key Vocabulary Ion – is a positively or negatively charged atom. Static Charge – this is an imbalance of electric charge on an object. Electric Force – this is an attractive or repulsive force exerted by all charged objects on each other.

Key Vocabulary Electric Field – this surrounds every electric charge and exerts forces on other electric charge. Insulator – Is a material in which electrons cannot move easily. Conductor – is material in which electrons can move or that transfers heat easily.

Key Vocabulary Electric Discharge – is rapid movement of excess charge from one place to another. Electric Current – is the flow of electric charge, measured in amperes. Circuit – is closed conducting loop in which electric current can flow continually. Voltage – is a measure of the amount of electrical potential energy in a flowing electric circuit can get.

Key Vocabulary Resistance – is a measure of how difficult it is for electrons to flow in a material. Ohm’s Law – states that the circuit equals the voltage divided by the resistance in the circuit. Series Circuit – is a circuit that has only one path for electric current to flow.

Key Vocabulary Parallel Circuit – is a circuit that has more than one path for electric current to flow. Electric Power – rate at which electrical energy is converted into other forms of energy, measured in watts or kilowatts. Load – is a device in a circuit that operates using electrical energy.

Resistor – is an object added to a circuit that restricts the flow of electrical energy. Switch – is a device that is used to control the flow of current through a circuit. Key Vocabulary

What are Ions? An atom that is positively or negatively charged because it has gained or lost electrons. Plasma is made up of ions.

An imbalance of electric charge on an object. Example When we rub a balloon to our head, what happens? The atoms in your hair hold their electrons more loosely than the atoms on the balloon. Electrons from the hair travel to the surface of the balloon. The hair becomes positively charged, while the balloon becomes negatively charged. “OPPOSITES ATRACT!” Static Charge

Electric Forces This is an attractive or repulsive force exerted by all charged objects on each other. “OPPOSITES ATTRACT”

Electric Field This surrounds every electric charge and exerts forces on other electric charge. Gets stronger as you get closer to a charge. +- The electric field arrows point away from a positive charge. The electric field arrows point toward a negative charge.

Insulators & Conductors A material in which electrons cannot move easily from place to place is an insulator. Materials that are conductors contain electrons that can move more easily in the material.

Electric Discharge Is a rapid movement of excess charge from one place to another. Lightening is an example of Electric Discharge.

Electric Current Is the flow of electric charge, measured in amperes. Solids – Flowing charges are electrons Liquids – Flowing charges are ions (Positively or negatively charged)

Circuit Is closed conducting loop in which electric current can flow continually. Usually has a resistor, load, & switch.

Series Circuit Is a circuit that has only one path for electric current to flow. Lets use a circuit with 2 light bulbs as an example, if one light bulb goes out the other goes out. You could say they go out in a “SERIES”.

Parallel Circuit Is a circuit that has more than one path for the electric current to follow. Lets use 2 light bulbs as an example, if one goes out the other will remain to glow.

Resistance Is the measure of how difficult it is for electrons to flow through a material. Insulators will have a higher resistance than conductors.

Ohm’s Law States that the circuit equals the voltage divided by the resistance in the circuit. Voltage = Current x Resistance When voltage in a circuit increases the current increases, or if the voltage does not change the current decreases. (in volts) (in amperes) (in ohms)

Question using Ohm’s Law A Light bulb is plugged into a wall outlet. If the light bulb has a resistance of 200 and the current in the light bulb is 1.5 A, what is the voltage provided by the outlet?

Answer is…

Electric Power Rate at which electrical energy is converted into other forms of energy, measured in watts or kilowatts. Power = Current x Voltage (in watts) (in amperes) (in volts)

Question A light bulb is plugged into a 205- V wall outlet. How much electric power does the light bulb use if the current in the bulb is 2.61 A?

Answer is…

Credits Crct Coach Book 8 th Grade Science Book Google pages D45-21B0-40C8-BDB4- C5D5058AA3DA/0/chp_electric_power_lin es_1.jpg ws/964/ JPG