G9 Unit 6 Electricity

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Electrical Potential Difference or Voltage• An electric cell gives energy to the electrons and pushes them round acircuit.• Voltage is the electrical energy supply needed to move each unit ofcharge from one point to another or a potential difference of twopoints.• Different voltages are supplied by different cells and batteries.1.5 V Dry Cell9 V Dry Cell
How to Measure Voltage?• The SI unit for voltage is volt (V).• A voltmeter is an instrument used for measuringvoltages.
Page 1 and 2: Unit 6:Electricity
Page 3 and 4: What is Electricity?Definition:Elec
Page 5 and 6: Kinds of ElectricityCurrent• The
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 21 and 22: Resistance• When an electric curr
Page 23: Resistance• The SI unit forresist
Page 33: 24
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
Page 54 and 55: Components Found in an Electric Cir
Page 56 and 57: • A switch is an electrical compo
Page 58 and 59: • Bulb• Variable resistor (rheo
Page 60 and 61: Workbook p. 160
Page 64 and 65: Series Circuit•Series Circuit - a
Page 66: Voltage drop•As each device in se
Page 70 and 71:
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).
Page 97 and 98:
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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