Experiment 1
... Definition: A general measure of how a component or group of components pushes against the current flowing through it. Impedance = resistance + reactance Impedance is used to refer to the behavior of circuits with resistors, capacitors and other components. When we consider components in a the ...
... Definition: A general measure of how a component or group of components pushes against the current flowing through it. Impedance = resistance + reactance Impedance is used to refer to the behavior of circuits with resistors, capacitors and other components. When we consider components in a the ...
ETEE3211 Fall 2004
... voltage varies from 32V to 42V and the load current varies 200mA to 400mA, select the value of Ri to maintain the constant voltage across the load. Determine the power rating required for the resistor and the zener diode. Extra Credit: (25 pts maximum) Assuming no loss in the rectifier diodes of the ...
... voltage varies from 32V to 42V and the load current varies 200mA to 400mA, select the value of Ri to maintain the constant voltage across the load. Determine the power rating required for the resistor and the zener diode. Extra Credit: (25 pts maximum) Assuming no loss in the rectifier diodes of the ...
UNIT IV
... logarithm of the current or voltage ratios for all the networks in series is very easily obtained as the simple sum of the various exponents. It has become common, for this reason, to define ...
... logarithm of the current or voltage ratios for all the networks in series is very easily obtained as the simple sum of the various exponents. It has become common, for this reason, to define ...
Ch. 9
... • More generally, we need to account for relative timing of one wave versus another. • This can be done by including a phase shift, : • Consider the two sinusoids: v1 t Vm sin t and v2 t Vm sin t ...
... • More generally, we need to account for relative timing of one wave versus another. • This can be done by including a phase shift, : • Consider the two sinusoids: v1 t Vm sin t and v2 t Vm sin t ...
SPS9. Students will investigate the properties of waves.
... b. Explain the flow of electrons in terms of alternating and direct current, the relationship among voltage, resistance and current, simple series and parallel circuits. c. Investigate applications of magnetism and/or its relationship to the movement of electrical charge as it relates to electromagn ...
... b. Explain the flow of electrons in terms of alternating and direct current, the relationship among voltage, resistance and current, simple series and parallel circuits. c. Investigate applications of magnetism and/or its relationship to the movement of electrical charge as it relates to electromagn ...
3.reactance_and_impedance
... Explain the relationship between AC voltage and AC current in a resistor, capacitor and inductor. Explain why a capacitor causes a phase shift between current and voltage (ICE). Define capacitive reactance. Explain the relationship between capacitive reactance and frequency. Explain why an i ...
... Explain the relationship between AC voltage and AC current in a resistor, capacitor and inductor. Explain why a capacitor causes a phase shift between current and voltage (ICE). Define capacitive reactance. Explain the relationship between capacitive reactance and frequency. Explain why an i ...
Standing wave ratio
In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide. Impedance mismatches result in standing waves along the transmission line, and SWR is defined as the ratio of the partial standing wave's amplitude at an antinode (maximum) to the amplitude at a node (minimum) along the line.The SWR is usually thought of in terms of the maximum and minimum AC voltages along the transmission line, thus called the voltage standing wave ratio or VSWR (sometimes pronounced ""viswar""). For example, the VSWR value 1.2:1 denotes an AC voltage due to standing waves along the transmission line reaching a peak value 1.2 times that of the minimum AC voltage along that line. The SWR can as well be defined as the ratio of the maximum amplitude to minimum amplitude of the transmission line's currents, electric field strength, or the magnetic field strength. Neglecting transmission line loss, these ratios are identical.The power standing wave ratio (PSWR) is defined as the square of the VSWR, however this terminology has no physical relation to actual powers involved in transmission.The SWR can be measured with an instrument called an SWR meter. Since SWR is defined relative to the transmission line's characteristic impedance, the SWR meter must be constructed for that impedance; in practice most transmission lines used in these applications are coaxial cables with an impedance of either 50 or 75 ohms. Checking the SWR is a standard procedure in a radio station, for instance, to verify impedance matching of the antenna to the transmission line (and transmitter). Unlike connecting an impedance analyzer (or ""impedance bridge"") directly to the antenna (or other load), the SWR does not measure the actual impedance of the load, but quantifies the magnitude of the impedance mismatch just performing a measurement on the transmitter side of the transmission line.