Logarithmic scales of measurement
Effective radiated power (ERP), synonymous with equivalent radiated power, is an IEEE standardized definition of directional radio frequency (RF) power, such as that emitted by a radio transmitter. It is the total power in watts that would have to be radiated by a half-wave dipole antenna to give the same radiation intensity (signal strength or power flux density in watts per square meter) as the actual source antenna at a distant receiver located in the direction of the antenna's strongest beam (main lobe). ERP measures the combination of the power emitted by the transmitter and the ability of the antenna to direct that power in a given direction. It is equal to the input power to the antenna multiplied by the gain of the antenna. It is used in electronics and telecommunications, particularly in broadcasting to quantify the apparent power of a broadcasting station experienced by listeners in its reception area. An alternate parameter that measures the same thing is effective isotropic radiated power (EIRP). Effective isotropic radiated power is the hypothetical power that would have to be radiated by an isotropic antenna to give the same ("equivalent") signal strength as the actual source antenna in the direction of the antenna's strongest beam. The difference between EIRP and ERP is that ERP compares the actual antenna to a half-wave dipole antenna, while EIRP compares it to a theoretical isotropic antenna. Since a half-wave dipole antenna has a gain of 1.64 (or 2.15 dB) compared to an isotropic radiator, if ERP and EIRP are expressed in watts their relation is If they are expressed in decibels (Wikipedia).
Physics 50 E&M Radiation (20 of 33) Plane E&M Waves and Power, Intensity
Visit http://ilectureonline.com for more math and science lectures! In this video I will discuss the relationship between intensity and power and find the number of photons entering the eye per second from Alpha Centari. Next video in series: http://youtu.be/Tz6OF5HhshU
From playlist PHYSICS 50 ELECTROMAGNETIC RADIATION
Physics demonstrations. Intensity of microwaves against distance
How does microwaves relate to safer use of a mobile phone? The results suggest that moving the mobile phone away from the head, even a few centimetres, could reduce the intensity reaching the head.
From playlist WAVES
Physics 50 E&M Radiation (31 of 33) Laser Light Example
Visit http://ilectureonline.com for more math and science lectures! In this video I will calculate the intensity and energy intensity of a laser light of power = 0.5mV, wavelength = 633nm, and diameter = 1mm.
From playlist PHYSICS 50 ELECTROMAGNETIC RADIATION
Physics 50 E&M Radiation (2 of 33) Frequency and Wavelength
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain electromagnetic radiation in terms of frequency and wavelength. Next video in series: http://youtu.be/t6EnTtkG4hA
From playlist PHYSICS 50 ELECTROMAGNETIC RADIATION
Electrical Engineering: Ch 12 AC Power (21 of 58) What is the Effective Current?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what is effective-current which is used in everyday applications of alternating-current (sometimes the current moves in one direction and other times the opposite direction, or current moves
From playlist ELECTRICAL ENGINEERING 12 AC POWER
Physics 50 E&M Radiation (30 of 33) Intensity of Light Example
Visit http://ilectureonline.com for more math and science lectures! In this video I will calculate the Emax and Bmax 5m away from a light source of 60W and wavelength of 700nm.
From playlist MOST POPULAR VIDEOS
Transverse and longitudinal waves: fizzics.org
An introduction to waves, transverse and longitudinal waves and the electromagnetic spectrum. Including wavelength, amplitude and frequency. Suitable for 14 to 16 physics students and a reminder for more advanced courses.
From playlist The electromagnetic spectrum and waves
How does an Antenna work? | ICT #4
Antennas are widely used in the field of telecommunications and we have already seen many applications for them in this video series. Antennas receive an electromagnetic wave and convert it to an electric signal, or receive an electric signal and radiate it as an electromagnetic wave. In t
From playlist Internet & Telecommunication Technology
06. Greenhouse Effect, Habitability
The Atmosphere, the Ocean and Environmental Change (GG 140) A simple model of the overall Earth's heat budget is derived. The Earth is assumed to be in equilibrium with the input of solar radiation balanced by the output of infrared radiation emitted by the Earth's surface. Using this m
From playlist Atmosphere, Ocean and Environmental Change with Ron Smith
Understanding Modulation! | ICT #7
Modulation is one of the most frequently used technical words in communications technology. One good example is that of your FM radio, where FM stands for frequency modulation. In this video we are going to learn the basics of modulation techniques and see how they are applied in modern ce
From playlist Internet & Telecommunication Technology
EEVblog #1187 - Room Heater Technology Explained
A comprehensive tutorial on room (space) heater technology and their effectiveness and efficiency in heating rooms and homes. The different types of heat transfer are discussed, along with the different types of heater technology available and how they apply to room and object heating. The
From playlist Debunking
eevBLAB #74 - 5G Causes EVERYTHING!
5G Causes EVERYTHING and must be stopped! Basically just 1 hour of Dave laughing at 5G nutjobs and the "5G Space Appeal" ICNIRP 5G Standards: https://www.icnirp.org/en/applications/5g/index.html SpaceX Starlink Satellite Transmitter Tech Specs: https://licensing.fcc.gov/myibfs/download.d
From playlist Debunking
30. Radiation Dose, Dosimetry, and Background Radiation
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu Units of radiation dose to biological
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
Physics - Nuclear Physics (20 of 22) Radiation: Examples of Equivalent Dose
Visit http://ilectureonline.com for more math and science lectures! In this video I will list and explain different examples of equivalent dose of radiation.
From playlist MODERN PHYSICS 2: ATOMIC AND NUCLEAR PHYSICS, PARTICLE PHYSICS
26. Chernobyl — How It Happened
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu Using all the information from the co
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
Physics - Thermodynamics 1: Ch 24.1 Variable Heat Transfer (13 of 25) Equilibrium Temperature
Visit http://ilectureonline.com for more math and science lectures! In this video I will find the equilibrium temperature=? of an object in a 0K environment that receives radiation from an object in one direction only. It's sort of like Earth receiving radiation from our Sun. Next video
From playlist PHYSICS 24.1 VARIABLE HEAT TRANSFER
32. Chemical and Biological Effects of Radiation, Smelling Nuclear Bullshit
MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016 Instructor: Michael Short View the complete course: https://ocw.mit.edu/22-01F16 YouTube Playlist: https://www.youtube.com/playlist?list=PLUl4u3cNGP61FVzAxBP09w2FMQgknTOqu Radiation damage to organisms is expl
From playlist MIT 22.01 Introduction to Nuclear Engineering and Ionizing Radiation, Fall 2016
PROGRAM LESS TRAVELLED PATH TO THE DARK UNIVERSE ORGANIZERS: Arka Banerjee (IISER Pune), Subinoy Das (IIA, Bangalore), Koushik Dutta (IISER, Kolkata), Raghavan Rangarajan (Ahmedabad University) and Vikram Rentala (IIT Bombay) DATE & TIME: 13 March 2023 to 24 March 2023 VENUE: Ramanujan
From playlist LESS TRAVELLED PATH TO THE DARK UNIVERSE
Earth System Science 21. On Thin Ice. Lecture 03. What Controls Earth's Global Temperature?
UCI ESS 21: On Thin Ice (Winter 2014) Lec 03. On Thin Ice -- What Controls Earth's Global Temperature? -- View the complete course: http://ocw.uci.edu/courses/ess_21_on_thin_ice__climate_change_and_the_cryosphere.html Instructor: Julie Ferguson, Ph.D. License: Creative Commons CC-BY-SA Te
From playlist Earth System Science 21: On Thin Ice: Climate Change and the Cryosphere
In this video i demonstrate sound waves interference and standing waves from loudspeaker used sound sensor. The frequency on loudspeaker is about 5500Hz. Enjoy!!!
From playlist WAVES