Static electricity is caused by an imbalance of electrons between two objects. Rubbing certain materials together, like fur and ebonite, can cause this imbalance as electrons are transferred. Conductors allow electrons to flow freely, while insulators impede electron flow. Static electricity has many uses, like in photocopiers, but can also be dangerous in situations like lightning or refueling. Electric current is the flow of electrons through a material over time. Resistance opposes this flow. Circuits use components like resistors, capacitors, and switches to control current. Electricity powers many appliances and lights in homes. Safety devices like fuses and circuit breakers help prevent overloads.
Malaysia SPM syllabus Physics Chapter 7 Part 4: Electromotive force and internal resistance
Also available for hire!
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Contents-
Electricity, Types of Electricity, Resistance, Ohms law, Volt, Voltmeter, Ammeter, Potential Differnce, Electric current, Electric circuit, etc.
Introduction of electricity,
TYPES O Electricity,
STATIC Electricity,
CURRENT Electricity,
TYPES OF CURRENT,
DC CURRENT,
AC CURRENT,
PARAMETERS OF ECLECTRICITY,
FREQUENCY,
WAVELENGTH,
VELOCITY,
ELECTROTHERAPY
USES OF ELECTROTHERAPY
MODALITIES IN ELECTROTHERAPY
Malaysia SPM syllabus Physics Chapter 7 Part 4: Electromotive force and internal resistance
Also available for hire!
Contact us for your presentation design needs: lesson / teaching, wedding, seminar, workshop, client pitch etc.
Contents-
Electricity, Types of Electricity, Resistance, Ohms law, Volt, Voltmeter, Ammeter, Potential Differnce, Electric current, Electric circuit, etc.
Introduction of electricity,
TYPES O Electricity,
STATIC Electricity,
CURRENT Electricity,
TYPES OF CURRENT,
DC CURRENT,
AC CURRENT,
PARAMETERS OF ECLECTRICITY,
FREQUENCY,
WAVELENGTH,
VELOCITY,
ELECTROTHERAPY
USES OF ELECTROTHERAPY
MODALITIES IN ELECTROTHERAPY
This PPT is made for class 10 students. It covers all the topics of CBSE curriculum. An interactive inforgraphic based demonstration for better understanding. Do ask questions for any confusion.
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2. 37
Static Electricity
Atoms are made up of electrons , protons and neutrons . These particles
have different properties. Electrons are tiny, very light particles that have
a negative electrical charge (-). Protons are much larger and heavier than
electrons and have the opposite charge, protons have a positive
charge. Neutrons are large and heavy like protons, however neutrons
have no electrical charge. Each atom is made up of a combination of
these particles.
Objects may be charged by rubbing. eg: Rub a piece of ebonite (very hard, black rubber)
across a piece of animal fur.
• The fur does not hold on to its electrons as strongly as the ebonite. At least some of
the
• electrons will be ripped off of the fur and stay on the ebonite. Now the fur has a
slightly
• positive charge (it lost some electrons) and the ebonite is slightly negative (it gained
some
• electrons).The net charge is still zero between the two… remember the conservation of
charge.
• No charges have been created or destroyed, just moved around.
3. Conductors & Insulators
Conductors are materials that permit electrons to flow freely from atom to atom and
molecule to molecule. An object made of a conducting material will permit charge
to be transferred across the entire surface of the object. eg. Wire
In contrast to conductors, insulators are materials that impede the free flow of
electrons from atom to atom and molecule to molecule. eg. Rubber
Electrostatic Induction: redistribution of electrical charge in an object,
caused by the influence of nearby charges.
4. Dangers & Uses of static electricity
Lightning Flue-ash precipitation
Refuelling Photocopiers
Operating theaters Inkjet printers
Computers
Electric field
Electric field is the region of space where an electric charge
experiences a force due to other charges and force can be felt.
5. 38
Electric Current
Electrical current is a measure of the amount of electrical charge transferred per unit time.
It represents the flow of electrons through a conductive material. Current is a scalar
quantity (though in circuit analysis, the direction of current is relevant). The SI unit of
electrical current is the ampere, defined as 1 coulomb/second.
Q= coulombs
I= amperes/current
t= time in seconds
Q= I.t
Circuit symbols
6. Circuits
Series : The current is the same at all points in a series circuit.
Parallel : The sum of the current in the branches of a parallel circuit
equals the current entering or leaving the parallel section.
7. Direct & Alternating current
In a direct current (d.c.) the electrons flow in one direction only.
Steady d.c.
Varying d.c.
In an alternating current (a.c.) the direction of flow reverses regularly.
8. 39
Potential difference
Potential difference is measured in volts (V) and the term voltage is sometimes used instead
of p.d. In a circuit, note that electrical energy, not change or current, is “used up”.
V= volts V= W / Q or W = Q . V
W= energy in joules
If Q is steady = W = I . t . V
Q= coulombs
Voltage in series : V1+V2+V3...=Vtotal
Voltage in parallel : V1=V2
9. 40
Resistance
The opposition of a conductor to current is called its resistance. A good conductor has
low resistance and a poor conductor has a high resistance. The resistance of a wire
of a certain material 1) increases as its length increases 2) increases as its cross-
section area decreaces 3) depends on the material.
R=V/I
R= resistance in ohm
V= voltage in volts V=I.R
I= current in amperes
I=V/R
Resistors in series = R1+R2+R3...=Rtotal
Resistors in parallel = 1/R1+ 1/R2+1/R3...=3/Rtotal
Rtotal/3= answer
11. Resistivity
The resistivity of a material is numerically equal to the resistance of a 1m length
of it of cross-section area 1m2.
Potential divider
V =I.R
12. 41
Capacitors
Practical capacitors are often classified according to the material
used as the dielectric, with the dielectrics divided into two
broad categories: bulk insulators and metal-oxide films.
Charging a capacitor: by connecting a battery across it.
Discharging a capacitor: when a conductor is connected across a
charged capacitor, there is a brief flow of electrons from the
negatively charged plate to a positively charged one.
13. Effect of capacitor in d.c. & a.c. circuits
In a d.c. Circuit the lamp does not light because a capacitor blocks d.c.
In an a.c. Circuit the lamp lights, suggesting that a capacitor passes a.c. In fact,
no current actually passes through the capacitor since its plates are
seperated by an insulator. But the a.c. reverses direction.
d.c.
14. 42
Electric power
Power = work done/time taken
= energy transfer/time taken
P=W/t
There are experiments to measure electric power. eg. Lamp, motor
Lamp: connect a circuit, note the ammeter and voltmeter readings and
work out the electric power supplied to the bulb in watts.
Motor: replace a bulb by a small electric motor. Attach a known mass in
kg to the axle of the motor with a length of thin string and find the time
t in seconds required to raise the mass through a known height in m at a
steady speed. Then the power output Po in W of the motor is given by :
Po=work done/ time taken
15. Electricity Lighting
Filament lamps: a small coil of tungsten wire, which becomes white hot when current
flows through it. The higher the temperature of the filament the greater is the
proportion of electrical energy transferred to light and for this reason it is made of
tungsren, a metal with a high melting point.
Fluorescent strips: five times as efficient and may last 3000 hours compared with the
1000 hour life of filament lamps.
Compact fluorescent lamps: energy saving fluorescent lamps fit straight into normal
light sockers, either bayonet or screw in. They last up to eight times longer and use
about five times less energy than filament lamps for the same light output.
16. Electric heating
Heating elements: domestic appliances are made from nichrome wire. This is an alloy
of nickel and chromium which does not oxidize when the current makes it red hot.
The elements in radiant electric fires are at red heat and the radiation they emit is
directed into the room by polished reflectors.
Three heat switch: this is sometimes used to control heating appliances . It has three
setting and uses two identical elements. On “HIGH” the elements are in parallel
across the supply voltage. On “Medium” current only passes through one and on
“LOW” they are in series.
Fuses: a fuse should ensure that the current carrying capacity of the wiring is not
exceeded.
17. Joulemeter
Instead of using an ammeter and a voltmeter to
measure the electrical energy transferred by
an appliance, a joulemeter can be used to
obtain directly in joules.
18. 43
Electricity in the HOME
Every circuit is connected in parallel with the supply. Switches and fuses are
always in the live wire and the lights are controlled from two places by the
two two-way switches. A house may have ring circuits each serving a
different area tp prevent wires to over heat. Fuses are plug to cut short
circuit. Earthing is important to discharge.
The residual circuit breaker also called the residual current device is an
adapted circuit breaker which is used when the resistanve of the earth
path between the consumer and the sub-station is not small enough for a
fault current to blow the fuse or trip the circuit breaker. Double insulation
is used to not make a direct connection with the internal electrical parts.
19. Paying for electricity
A kilowatt-hour is the electrical energy used by a
1 kW appliance in 1 hour.
eg. 1 kWh=1000J/s x 3600s
=3600000J =3.6 MJ