Welcome great EduPodian, here is your Third Term SS1 Physics Lesson Note excerpt.

Scheme of Work

1 Electric Circuit (DC).
2 Resistors and Cells in Series and Parallel.
3 Electrical Energy and Power
4 Safety Device – Fuse
5 Atomic Structure, Diffusion and Osmosis
6 Crystal Structure of Matter – Amorphous and Crystalline Substances
7 Surface Tension
8 Capillarity
9 Elasticity
10 Energy Stored in an Elastic Material
11 Revision
12 Examination

REFERENCE BOOKS
• New School Physics By M.W Anyahkoha
• New System Physics By Dr. Charles Chow.

Week 1:

TOPIC: ELECTRIC CIRCUIT
CONTENT
• Definition and functions of electric circuit and its components
• Definition of some physical quantities in dc circuit
• Verification of ohm’s law

Before explaining electric circuit, let us define some terms
1. Conductors: They are materials which allow electrons to pass through them easily e.g. metal, graphite, acids, salt solution etc.
2. Semi conductors: They are materials whose resistivity is mid way between
good conductors and insulators e.g. germanium, silicon etc
3. Insulators: They are materials which do not allow electrons to pass through
them e.g. paper, plastic, glass, oil, cotton, dry hair, polythene etc

Electric Circuit: An electric circuit is a complete path provided for the flow of electric current. The circuit diagram below is a symbolic representation of such… Click here to order the complete Physics Lesson Note for SS1 third term

Week 2:

TOPIC: RESISTORS & CELLS CONNECTED IN SERIES & PARALLEL
CONTENT
• Resistors in series and parallel
• Cells in series and parallels
• Resistors in series: These are end to end connection.

CHARACTERISTICS
 Same current flow through each resistor IT= I1 = I2 =I3
 Potential difference across each resistor is different V1 ≠ V2 ≠V3
 P.d are additive VT= V1 + V2 +V3
 Power are additive
 Applied voltage equals the sum of different p.d VT= V1 + V2 +V3
 Resistance are additive.
RT = R1 + R2 + R3 _______ for 3 resistors
RT = R1 + R2 + R3….. + Rn ___ for n numbers or resistors

RESISTORS IN PARALLEL
These are side by side connection… Click here to order the complete third term Physics Lesson Note for SS1

Week 3:

TOPIC: ELECTRICAL ENERGY AND POWER
CONTENT
• Electrical Energy
• Electrical Power
• Buying Electrical Power

ELECTRICAL ENERGY
Energy = Work (Joules)
W = QV_______________________(1)

But Q = It

W = VIt ______________________(2)

From ohm’s law V = IR
W = I2Rt______________________(3)

From ohm’s law I = V/R
W = V2t/R_____________________(4)

W = QV = VIt = I2Rt = V2t/ R

ELECTRICAL POWER
Power = work done/time taken (watt) __ (5)
P =QV/t = VI = I2R = V2/R…………….(6)

EVALUATION
1. The headlamp of a car takes a current of 0.4A from a 12v supply.Calculate the energy produced in 5 minutes.
2. State four factors that affect the resistance of a conducting wire.

BUYING OF ELECTRICAL ENERGY
Commercial power is consumed in kilowatt- hour (kWh)
NB 1kwh = 3.6 х106 J = 3.6MJ
Cost = Pct/ 1000………………………….(7)
P – Power (w) NB : P(W)/ 1000 = P (KW)
c – Cost per kWh (unit) it means that it is in kWh
T – Time (hr)… Click here to order the complete Lesson Note on Physics SS1 third term

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