END116 Assignment 5- circuits (1)

3.9 A platinum resistance temperature sensor has a resistance of 120 Q at 0°C and forms one arm of a Wheatstone bridge. At this temperature the bridge is balanced with each of the other arms being 1202. The temperature coefficient of resistance of the platinum is 0.0039/K. What will be the output voltage from the bridge for a change in temperature of 20°C? The loading across the output is effectively open circuit and the supply voltage to the bridge is from a source of 6.0 V with negligible internal resistance.

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1. The input signal in Figure 1(a) is applied to the comparator in Figure 1(b).Draw the output showing its proper relationship to the input signal. Assume the maximum output levels of the comparator are (+/-)12 V. Values of R1 and R2 are as follows. (a)R1 = 7 K Ohm, R2 = 3 K Ohm (b)R1 = 3 K Ohm, R2 = 7 K Ohm Handwriting +10 Volt R1 Vin 0 oVout Vin R2 -5 V Figure 1(b) Figure 1(a)

Based on electric circuit shown in Figure 2. Determine whether the LED 1 and LED 2 is “ON" or "OFF" for V1 = 2V and V1 = 3.5V if for both LEDS are silicon LED. Explain the answer given. V1 OUT R1 OPAMP 100kN V2 LED 1 LED 2 4Vdc R2 500kn Figure 2: Op-Amp circuit with LED

On the circuit board in figure below, what happens if the middle lead (wiper) of the 100k potentiometer is broken?

Voltage Zener is used in the circuit below and the load current is to vary from 12 to 100 mA. Find the value of series resistance R and the range of load resistance to maintain a voltage of 7.2 V across the load. The input voltage is constant at 12V and the minimum Zener current is 10 mA. ... IL R Iz Eo RL Vz E, = 12 V

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This is a practice problem from the Introduction to Electronics course in my Electrical Engineering program. Could you please walk me through the steps of solving it so that I can solve more complicated ones in the future? Thank you for your assistance.

V1 R1 V2 Da Db R2 www V3 Given that R1=2k, R2=1k, and Da and Db are Si Diodes: a. What is V3 in terms of V1 when Da is ON? b. What is V3 in terms of V1 when Db is ON? c. What is V3 in terms of V1 when Da and Db is OFF?