G9 Unit 6 Electricity

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Resistance• Good conductors of electricity have LOWRESISTANCE. (Eg. Metal objects)– Electricity is able to flow through them very easily• Poor conductors of electricity have HIGHRESISTANCE. (Eg. Wood, cloth)– Electricity is not able to flow through them easily
Resistance• The SI unit forresistance is ohm ()• Different electricalcomponents havedifferent resistance.• Rheostat is used tomeasure the resistance.
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 18 and 19: Electrical Potential Difference or
Page 21: Resistance• When an electric curr
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
Page 72 and 73:
Determine the (a) totalresistance o
Page 74 and 75:
The circuit shown contains a 9-volt
Page 76 and 77:
4. Solution- part 2- Use resistance
Page 78 and 79:
• Determined the total current in
Page 80 and 81:
Sample Problem 5:• Determined the
Page 82 and 83:
Parallel Circuits•In parallel cir
Page 84:
Parallel Circuit Calculation Rules
Page 87 and 88:
1R t= 1 R 1+ 1 R 2+ 1 R 31R t=1+ 1+
Page 89 and 90:
Sample Problem 1•Find the total c
Page 91 and 92:
Solving Problem 2:1. Looking for:-
Page 93 and 94:
Calculations ofElectrical Energy an
Page 95 and 96:
• Power is measured in watts (W).
Page 97 and 98:
Sample Problem 1:• Samson spends
Page 99 and 100:
Sample Problem 3:• A consumer use
Page 101 and 102:
Calculation of Electricity Cost in
Page 104 and 105:
Sample Problem 1:A household which
Page 106 and 107:
Importance of SafetyPrecaution in t
Page 108 and 109:
Three possible dangers in electrici
Page 110 and 111:
Three possible dangers in electrici
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• Earth wire - a safety wireand c
Page 114 and 115:
• Circuit breakers- Miniature Cir
Page 116:
Earth Leakage Circuit Breaker (ELCB
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G9 Unit 6 Electricity

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