G9 Unit 6 Electricity

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Where does Electricity come from?Mainly 2 sources:1) Power Stations- Supply a lot of electricity- Used in many electrical appliances2) Electric Cells (batteries)- Supply a little electricity- Portable- Safe
Kinds of ElectricityCurrent• The flow of electriccharges carried through amaterial such as wire orother conductors• Examples– Power linesStatic• An electric charge thatcollects or builds up onthe surface of an object• Examples– Lightning
Page 1 and 2: Unit 6:Electricity
Page 3: What is Electricity?Definition:Elec
Page 7 and 8: How does an Electrical Appliance Wo
Page 9 and 10: Electric Charges• Electric charge
Page 11 and 12: Electrical QuantityElectric Current
Page 13 and 14: How to Measure Current?• The SI u
Page 16 and 17: Direct Current (DC)• An electricc
Page 18 and 19: Electrical Potential Difference or
Page 21 and 22: Resistance• When an electric curr
Page 23: Resistance• The SI unit forresist
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Page 36 and 37: Ohm’s Law• The current that flo
Page 38 and 39: Chart
Page 40 and 41: Sample Problem 1:Find the current t
Page 42 and 43: Find the applied voltage of a circu
Page 44 and 45: Sample Problem 5A light bulb uses 2
Page 50 and 51: Electrical Circuitsand Connections
Page 52 and 53: Open and Closed CircuitClosed Circu
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Components Found in an Electric Cir
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• A switch is an electrical compo
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• Bulb• Variable resistor (rheo
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Workbook p. 160
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Series Circuit•Series Circuit - a
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Voltage drop•As each device in se
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Sample Problem 1A series circuit co
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Determine the (a) totalresistance o
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The circuit shown contains a 9-volt
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4. Solution- part 2- Use resistance
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• Determined the total current in
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Sample Problem 5:• Determined the
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Parallel Circuits•In parallel cir
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Parallel Circuit Calculation Rules
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1R t= 1 R 1+ 1 R 2+ 1 R 31R t=1+ 1+
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Sample Problem 1•Find the total c
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Solving Problem 2:1. Looking for:-
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Calculations ofElectrical Energy an
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• Power is measured in watts (W).
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Sample Problem 1:• Samson spends
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Sample Problem 3:• A consumer use
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Calculation of Electricity Cost in
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Sample Problem 1:A household which
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Importance of SafetyPrecaution in t
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Three possible dangers in electrici
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Three possible dangers in electrici
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• Earth wire - a safety wireand c
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• Circuit breakers- Miniature Cir
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Earth Leakage Circuit Breaker (ELCB
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G9 Unit 6 Electricity

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