A lossless vacuum-filled transmission line of characteristic impedance R. = 1000 is terminated by a purely resistive load RL. The transmission line is driven by a sinusoidal voltage generator at a frequency {. The voltage standing wave pattern is measured and it is found that (i) the voltage standing wave ratio is S=2 ; (ii) there is a voltage maximum at the load; (i) as one moves away from the load, the first voltage minimum occurs at a distance of 0.1 meters from the load. A voltage minimum Occurs here Sinusoidal voltagez gene rator Ro Ru = 100S O.1m (a)What is the wavelength in meters? What is the frequency f in Hertz? (b)What is the load resistance R, ?

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.