electricity and magnetism
TRANSCRIPT
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ELECTRICITY AND MAGNETISM
A JOURNEY TOWARDS THE SMALLEST PART OF MATTER
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TOPICS
• Electric fields and magnetic field• The presence of magnetic field in current carrying wire.
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OBJECTIVES:
• Explain the behavior of charges in the electric field. • State that a magnetic field exists around a current carrying wire.• Explain how electricity is related to magnetism and the nature of magnetic
field.
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ACTIVITY Group ActivityGroup 1 Charge HockeyGroup 2 Magnetic FieldGroup 3 Magnetic fieldGroup 4 Magnetic fieldGroup 5 Charge Hockey
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EM Induction
Magnetic Field (B)
Magnetism
B due to I
Force of B on I
ElectromagnetsMotors
Faraday’s Law
•Generator/Transformer•Power Transmission
• Magnetic Field• Magnetic forces
• Electrical Power• Electrical energy
Electric circuit/connection
Ohm’s Law
Electric Charge
Electric Force
Electric Field
Electric Potential
WORLD OF ELECTRICITY AND MAGNETISM
Electric Current (I)
Electrostatics
Magnetic Field and Current
• Positive and negative electric charges• Attraction/Repulsion between charges
Electric currentElectric circuits (at home)
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• Involves…Electric charges
The forces between them and their behavior in materials
Electrostatics
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THE CHARGES…•Everything is made of atoms which contain POSITIVE particles called PROTONS and NEGATIVE particles called ELECTRONS.
Proton (+)
Neutron
Electron (-)
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•An atom will usually have the same number of positives and negatives•This makes the atom NEUTRAL.
Proton (+)
Neutron
Electron (-)
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WHAT IS INSIDE AN ATOM?
Thomson’s Plum pudding model
Rutherford model
Rutherford Bohr model
Charge cloud modelQuantum model of the nucleus
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ELECTRICAL CHARGE
• Electric charge is given the symbol
qElectrons are the charge carriers that flow in an electrical circuit –from the negative to positive terminals.
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ELECTRICAL CHARGE
• Charge is measured in
Coulombs• which is given the symbol
C
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ELECTRICAL CHARGE
• The charge on a proton is
1.6 x 10-19C• which is the same size as the charge on an electron.
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FUNDAMENTAL RULE OF THE BASE OF ALL ELECTRICAL PHENOMENALike charges repel;
Opposite charges attract.
Source; Paul Hewitt, (1998). Conceptual physics, CA: Saunders Publishing
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CHARGING PROCESS
• Charging by friction and contact
• Charging by induction• Charge polarization
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ELECTRIC FIELDS AND POTENTIALS
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ELECTRIC FIELDThe space around every electric charge is filled with an electric field-a kind of aura that extends through space.
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ELECTRIC POTENTIALS
Electric Potentials (volt): work done per unit charge (Bringing a very small positive charge from one point to the other.)
1volt = 1
JOULE COULOMB
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POTENTIAL DIFFERENCE OR VOLTAGE (V)
A 9 V battery will give how much energyto each coulomb of charge passingthrough the battery?
9 J
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POTENTIAL DIFFERENCE OR VOLTAGE (V)
A 1.5 V battery will give how much energyto each coulomb of charge passingthrough the battery?
1.5 J
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POTENTIAL DIFFERENCE OR VOLTAGE (V)
A battery with a p.d. of 6V will give howmuch energy to each coulomb of chargepassing through the battery?
6 J
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VOLTAGE OR P.D.
Voltage (or p.d.) is measured in
voltsand is given the symbol
V
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WHAT IS ELECTRIC CURRENT?movement of charge round a circuit.
We call this electric current.
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ELECTRIC CURRENT: FLOW OF CHARGE
tqI
SI Unit; 1 C/s = 1 ampere, AAfter the French mathematician Andre-Marie Ampere
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CHARGE, CURRENT & TIME
•If current is charge flowing per second then
tQI
time in seconds (s)
Current in Amps (A)
Charge transferred in coulombs (C)
so a current of 1 A is 1 C of charge transferred in 1 s.
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BASIC CIRCUITS
• Source• Switch• Conductor wire• Load (Bulb)
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Why can a bird sit safely on thishigh voltage power line?
What will happen if the bird spreads its wings and touches the pylon?
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SUMMARY OF UNITSQuantity Symbol Units Symbolcharge Q coulombs Ctime t seconds scurrent I amperes Avoltage V volts V
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Magnets in Electricity
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A magnetic field is the region around amagnet in which a magnetic force can bedetected.
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A moving charge (electric current) produces magnetic fieldHans Christian Oersted
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IT CAME FROM…• Moving/ spinning electron.• It is due to the distortion in
the electric field caused by the motion (Einstein, 1905, Theory of special relativity).
• Every moving/spinning electron is a tiny magnet.
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WE CALL IT ELECTROMAGNET
• When magnetic field is produced in the current-carrying wire.
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APPLICATIONS ARE…
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THANK YOU
I can do all things through Christ which strengthen me.Philippians 4:13
To God be the Glory
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REFERENCES
• Murphy & Smooth, (1998). Physics principles and problems, Toronto, Canada: Charles E. Merill Publishing Co.
• Eby & Horton, (1986). Physical science, New York: Macmillan Publishing Company
• Jones & Childers, (1992). Contemporary college physics, 2ndEd, California: Addison-Wesley Publishing Company
• Paul Hewitt, (1998). Conceptual physics, CA: Saunders Publishing