Electrical Symbols

SNC 1D

Drawing a circuit

Each item has a symbol• Bulb

• Connecting Wires

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• Battery

• Switch

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Circuit Diagram

Series Circuit

Only ONE path for the flow of electrons.

Parallel circuit

More than one path for the flow of electrons

Measuring Electron flow.

• Electron flow = current represented by the letter I (I)

• Electrons are so tiny that electrons are grouped into units called a COULOMB (C)

• 1Coulomb = 6.25 X 1018 electrons.• Each electron carries a negative charge (Q)• http://www.youtube.com/watch?v=5laTkjINHrg

Calculating Current

• Current (I) = charge(coulombs) time (secs)

I = Q t = Amperes or amps (A)

Ammeter

• The current can be measured with an instrument called an Ammeter, symbol: