this slide tell u about the frequency and power

1. Frequency
Frequency is the number of occurrences of a
repeating event per unit time.
Frequency is the rate at which current changes
its direction per second. It is measured in hertz
(Hz), an international unit of measure where 1
hertz is equal to 1 cycle/second. Hertz (Hz) = One
hertz is equal to one cycle per second.
Cycle = One complete wave of alternating current
or voltage.

2. Frequency
At its most basic, frequency is how often
something repeats. In the case of electrical
current, frequency is the number of times a sine
wave repeats, or completes, a positive-to-
negative cycle.
The more cycles that occur per second, the higher
the frequency.
Alternation = One half of a cycle.
Period = The time required to produce one
complete cycle of a waveform.

3. Amplitude, Velocity and Wavelength
Amplitude—maximum displacement from
the equilibrium position of an object
oscillating around such equilibrium position.
Wavelength λ—The distance from the
"crest" (top) of one wave to the crest of the
next wave is the wavelength. The
wavelength of a wave describes how long
the wave is.

4. Amplitude, Velocity and Wavelength
Wave speed is the distance a wave travels
in a given time, such as the number of
meters it travels per second.

6. Frequency
Frequency is typically used to describe electrical
equipment’s operation. Below are some common
frequency ranges:
• Power line frequency (normally 50 Hz or 60 Hz).
• Variable-frequency drives, which normally use a
1-20 kilohertz (kHz) carrier frequency.
• Audio frequency range: 15 Hz to 20 kHz (the
range of human hearing).
• Radio frequency: 30-300 kHz.
• Low frequency: 300 kHz to 3 megahertz (MHz).
• Medium frequency: 3-30 MHz.
• High frequency: 30-300 MHz.

7. Frequency
Circuits and equipments are often designed to
operate at a fixed or variable frequency. Equipment
designed to operate at a fixed frequency performs
abnormally if operated at a different frequency
than specified. For example, an ac motor designed
to operate at 60 Hz runs slower if the frequency
drops below 60 Hz, faster if it exceeds 60 Hz. For ac
motors, any change in frequency causes a
proportional change in motor speed. Another
example is a 5% reduction in frequency produces a
5% reduction in motor speed.

8. Resonance
Resonance describes the phenomenon of
increased amplitude that occurs when
the frequency of an applied periodic is equal or
close to a natural frequency of the system on
which it acts. When an oscillating force is
applied at a resonant frequency of a dynamic
system, the system will oscillate at a higher
amplitude than when the same force is applied
at non-resonant frequencies.

9. Resonant Frequency
Frequencies at which the response amplitude is
a relative maximum are known as resonant
frequencies or resonance frequencies of the
system. Small periodic forces that are near to
the resonant frequency of the system have the
ability to produce large amplitude oscillations in
the system due to the storage of vibration
energy.

11. Power
In electrical circuits, power is the amount
of energy transferred or converted per unit time.
In the International System of Units, the unit of
power is the Watt (W), equal to one joule per
second. W=J/S
Power is a scalar quantity.
The power dissipated in an electrical element of
a circuit is the product of the current flowing
through the element and of the voltage across
the element.

12. Energy
• In physics, energy is defined as the amount of
work that can be performed by force,
whereas power is defined as the rate at which
work is performed.
• Joule is a derived unit of energy in the
International System of Units.
• 1 Joule= 1 Newton/ 1 meter
• There are different forms of energy. These
include kinetic, potential, thermal,
gravitational, electromagnetic, sound, light and
elastic.

13. Difference between Power & Energy
• The word “energy” is used to describe many
different things—how we heat and cool our homes,
how we fuel cars, and even how we’re feeling on a
day. Energy isn’t something that can be seen or felt,
but you can see and feel the effects when energy is
transferred from one place to another.
• Energy is what makes change happen and can be
transferred form one object to another. Energy can
also be transformed from one form to another.
• Power is the rate at which energy is transferred. It is
not energy but is often confused with energy. The
watt is the most commonly used unit of measure
for power.
• It measures the rate of energy transfer.