Indicator Statement: Analyze the functioning and applications of electrical systems. Objective(s): Explain science and mathematical concepts applied in

Part 1: The Spark of TechnologyDigital Electronics

Long Reach High School - Foundations of Technology - Mr. Ash

Objectives

Indicator Statement: Analyze the functioning and applications of electrical systems.

Objective(s):Explain science and mathematical concepts applied in electrical technology. Such as: Resistance Current (AC & DC) Voltage Circuits Magnetism Ohm’s Law Ratio

Identify and describe how various types of electric circuits (i.e. series and parallel) provide a means of transferring and using electrical energy to produce heat, light, sound, as well as chemical changes.

Solve for the unknown in a linear equation related to electrical technology.

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The Big Picture

Electricity is a natural force of nature.

It is a general term for the presence and flow of electrons making an electric charge.

Over the past 100 years people have harnessed this force and integrated it into a variety of electronic devices that have become the backbone of our society.

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Electrical Vs. Electronic

The technology of producing, storing, controlling,transmitting and getting work from electrical energy.

Electrical Technology

The technology of using small amounts of electricity for controlling, detecting,collecting, storing, retrievingand processing information

Electronic Technology

Generator, Motor, Electric Heater, etc.

Thermostat, Computer,Cell Phone, Digital Watch, etc.

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Circuitry

An Electronic Circuit consist of a path for electrons to flow from an energy source.

The Amount of Electron Flow depends on the resistance in the circuit.

More Resistance = Less Flow.

If there are no components in a circuit except a battery it causes a short circuit which drains the charge quickly.

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Tri-force (Voltage, Current, Resistance)

Voltage (Volts) Equation: V• The electrical force that moves electrons through a conductor. • Voltage is electrical pressure also known as

EMF (Electro Motive Force) that pushes electrons.

Current (Amps / Amperes) Equation: I • The flow rate of electrons moving past a point within one second.

Higher Voltage = Higher Current• Current flow is also known as amperage, or amps for short.

Resistance ( Ohms / Ω ) Equation: R• The force that reduces or stops the flow of electrons. • It opposes voltage. More Resistance = Less Current.

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Ohm’s Law

Ohm suggested that if you double the Voltage across something that provides resistance, then the current would double.

Georg Ohm’s Law

Current Resistance

VoltageV = I Rx

I = VR

R = VI

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Series vs. Parallel Circuits

Each component has the same current. If two components are identical voltage is divided equally.

… in Series

There are two ways of connecting components:

Each component has the same voltage. Both components have full voltage.

… in Parallel

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Circuit Symbols

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Battery (Cell) Wire

WIRES JOINED WIRES NOT JOINED

Ground (Earth)LED (Light Emitting Diode)

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Circuit Symbols

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Lamp (Light Bulb) Resistor

Meters

Switches

Push Button Switch SPST – Normal Switch

Buzzer

Volt Meter Ammeter

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Review

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An Electronic Circuit consist of a path for to flow from an energy source.

electrons Voltage

CurrentResistance

WIRES NOT JOINED

Wire

Resistor

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Explore

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Open and complete the electronics web quest. You may work with a partner. Once completed, submit the web quest to the hand-in folder.

Electronics Web Quest

Hand Out > Ash > Electronics > Electronics Webquest.doc

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Documents

Indicator Statement: Analyze the functioning and applications of electrical systems. Objective(s): Explain science and mathematical concepts applied in