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Microsoft Word - PHY 204 Exp. 1 Electric Field Mapping
... Induced Electric field lines form closed loops that curl around the (negative) B-field change in a right-hand sense (ie, with right thumb along –B , E curls with fingers). This induced E is most intense at the outer edge of a uniform magnetic field region; it is spread along a larger circumference ...
... Induced Electric field lines form closed loops that curl around the (negative) B-field change in a right-hand sense (ie, with right thumb along –B , E curls with fingers). This induced E is most intense at the outer edge of a uniform magnetic field region; it is spread along a larger circumference ...
Transformers - Port Hope High School
... across this coil. 2. Secondary coil – this provides the output voltage Vs (voltage across the secondary coil) to the external circuit. 3. Laminated iron core – this links the two coils magnetically. Notice that there is no electrical connection between the two coils, which are constructed using insu ...
... across this coil. 2. Secondary coil – this provides the output voltage Vs (voltage across the secondary coil) to the external circuit. 3. Laminated iron core – this links the two coils magnetically. Notice that there is no electrical connection between the two coils, which are constructed using insu ...
RC and RL Circuits
... As the capacitor stores energy when voltage is first applied to the circuit or the voltage applied across the capacitor is increased during the circuit operation. As the capacitor releases energy when voltage is removed from the circuit or the voltage applied across the capacitor is decreased du ...
... As the capacitor stores energy when voltage is first applied to the circuit or the voltage applied across the capacitor is increased during the circuit operation. As the capacitor releases energy when voltage is removed from the circuit or the voltage applied across the capacitor is decreased du ...
Electronics and Photonics Revision Sheet
... changing the value of R2 to 20k . What effect did this increased resistance have on the current through each resistor and the battery? ...
... changing the value of R2 to 20k . What effect did this increased resistance have on the current through each resistor and the battery? ...
Ph 213 – Challenging Problems (set 6) Name: Due: August 6, 2013
... constant τ the current drops to 1/e I0 = 0.37 I0 E) After keeping the switch S in position 2 for a long time, the switch is thrown to position 1 again. Immediately after the switch has been thrown to position 1, find the current through the battery. After a long period in position (2) the capacitor ...
... constant τ the current drops to 1/e I0 = 0.37 I0 E) After keeping the switch S in position 2 for a long time, the switch is thrown to position 1 again. Immediately after the switch has been thrown to position 1, find the current through the battery. After a long period in position (2) the capacitor ...
ENE 429 Antenna and Transmission Lines
... Step 2 – Locate zL in the Smith Chart Step 3 – Identify the corresponding load reflection coefficient 0 in the Smith Chart both in terms of its magnitude and phase. Step 4 – Rotate 0 by the length in terms of wavelength or twice its electrical length d to obtain in(d). Step 5 – Record the norm ...
... Step 2 – Locate zL in the Smith Chart Step 3 – Identify the corresponding load reflection coefficient 0 in the Smith Chart both in terms of its magnitude and phase. Step 4 – Rotate 0 by the length in terms of wavelength or twice its electrical length d to obtain in(d). Step 5 – Record the norm ...
introduction - University of Toronto Physics
... period of time, then rapidly becomes negative and remains constant for the same time, and then repeats positive again, etc., to produce a waveform as illustrated: - ...
... period of time, then rapidly becomes negative and remains constant for the same time, and then repeats positive again, etc., to produce a waveform as illustrated: - ...
Crystal radio
A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio. It needs no other power source but that received solely from the power of radio waves received by a wire antenna. It gets its name from its most important component, known as a crystal detector, originally made from a piece of crystalline mineral such as galena. This component is now called a diode.Crystal radios are the simplest type of radio receiver and can be made with a few inexpensive parts, such as a wire for an antenna, a coil of copper wire for adjustment, a capacitor, a crystal detector, and earphones. They are distinct from ordinary radios as they are passive receivers, while other radios use a separate source of electric power such as a battery or the mains power to amplify the weak radio signal so as to make it louder. Thus, crystal sets produce rather weak sound and must be listened to with sensitive earphones, and can only receive stations within a limited range.The rectifying property of crystals was discovered in 1874 by Karl Ferdinand Braun, and crystal detectors were developed and applied to radio receivers in 1904 by Jagadish Chandra Bose, G. W. Pickard and others.Crystal radios were the first widely used type of radio receiver, and the main type used during the wireless telegraphy era. Sold and homemade by the millions, the inexpensive and reliable crystal radio was a major driving force in the introduction of radio to the public, contributing to the development of radio as an entertainment medium around 1920.After about 1920, crystal sets were superseded by the first amplifying receivers, which used vacuum tubes (Audions), and became obsolete for commercial use. They, however, continued to be built by hobbyists, youth groups, and the Boy Scouts as a way of learning about the technology of radio. Today they are still sold as educational devices, and there are groups of enthusiasts devoted to their construction who hold competitions comparing the performance of their home-built designs.Crystal radios receive amplitude modulated (AM) signals, and can be designed to receive almost any radio frequency band, but most receive the AM broadcast band. A few receive shortwave bands, but strong signals are required. The first crystal sets received wireless telegraphy signals broadcast by spark-gap transmitters at frequencies as low as 20 kHz.