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19 Cards in this Set

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What do we need electricity for everyday?

- Motion


- Heating/Cooling


- Light


- Communication

What is Static Electricity?

An imbalance of electric charge on the surface of an object.

The Law of Electric Charge states that...

- like charges repel


- opposite charges attract

Charging Objects


Friction

Rubbing 2 n° objects together.

Charging Objects


Conduction

Charging an object with an already charged object.

Charging Objects


Induction

Charging a n° object by bringing another charged object close to it, but not touching.

Current Electricity: Conductors

A material that transmits energy easily.

Current Electricity: Insulators

Materials that resist or block the flow of electrons

Current Electricity: DC

Direct Current.


Flow of electrons is in one direction only.

Current Electricity: AC

Alternating Current.


Current that repeatedly reverses direction.

Series Circuits

Electricity has only one path to follow.


(Ex: flashlight, toys, drill)

Series Circuit: Measuring Electric Current

( I )


The rate of flow of e- past a certain point in a circuit.



Measured in Amperes ( A )


Ammeter must be connected in series with a load in a circuit.

Parallel Circuits

The electricity has more than one path to follow.


(Homes are parellel because devices can be switched on/off individually.

Parallel Circuits: Voltmeter

Measures the voltage drop between 2 points of an electric circuit.


Voltage drop is measured by connecting a voltmeter in parallel between 2 points in a circuit.

ELECTRICAL SAFETY- Wall Outlets

1. Made of plastic. Plastic does not conduct electricity.


2. Most new outlets have a third hole called the ground terminal. This allowed electricity to leave the building and go into the ground.


3. New wall outlets have polarized plugs. So the appliance will only fit in the outlet one way.

GFCI

Ground Fault Circuit Interrupter


Includes circuit breaker that responds to very small changes in current and interrupts (stops) the flow of electricity.

Electrical Power

The rate at which electrical energy is produced or used.


Unit of Measurement is the Watt. (W)

Kilowatt-hour

(kW-h)


Measures electrical energy usage.



Formula: (kW-h) (h) (¢/kW-h)

Ohm's Law

As potential difference across a load increases, so does the current.



Formula: V=I×R