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- Q.1: An RC circuit with a 54.0 V power source is connected to a fluorescent lamp as shown in the Note: Show your work in full to get credit A #: Ac0522odo surc. The lamp L turns on when the voltage across the capacitor reaches 45.0V, which nappens after 0.65 seconds after the switch is closed. If R = 3M2, (a) what is the value oI uhe capacitance C? (b) If we must switch the lamps 3 times in a second, what should be the value of capacitance? (c) What is the charge on the capacitor when the lamp just flashes in both the cases? ). vakue of capacetonce ww R C: 54.0Va. A uniform steel girder AB is 6.0 m long and has a mass equivalent to 4.0 kN acting at its centre. The girder rests on two supports at C and B as shown in figure 2. A point load of 20.0 kN is attached to the beam as shown. Prove that the value of the force F would cause the beam to just lift off the support B.A single ion channel is selectively permeable to K* and has a resistance of 2.40 G2. During an experiment, the channel is open for approximately 1.80 ms while the voltage across the channel is maintained at +80.5 mV with a patch clamp. How many ions, N, travel through the channel? N = K+ ions
- As shown , draw a graph of potential difference across the resistor versus time, showing at least two intervals of τ . Also draw a graph of current versus time for this situation.Power Rating of a Resistor. The power rating of a resistor is the maximum power the resistor can safely dissipate without too great a rise in temperature and hence damage to the resistor. (a) If the power rating of a 15 k 2 resistor is 5.0 W, what is the maximum allowable potential difference across the terminals of the resistor? (b) A 9.0 k resistor is to be connected across a 120 V potential difference. What power rating is required? (c) A 100.0 and a 150.0 resistor, both rated at 2.00 W, are connected in series across a variable potential difference. What is the greatest this potential difference can be without overheating either resistor, and what is the rate of heat generated in each resistor under these conditions?An accumulator with U1=150 V and negligible internal resistance is connected to a voltage divider as shown in the figure. a) How big will the voltage U2 be if no external load is connected? b) How large will U2 be if a load with resistance RL = 2250.0 Ω is connected between A and B? c) How large will U2 be if a load with resistance RL = 9000.0 Ω is connected between A and B? d) How big will the effect be in the load c)?
- Figure P18.19 shows aWheatstone bridge, acircuit used to preciselymeasure an unknownresistance R by varyingRvar until the ammeterreads zero currentand the bridge is saidto be “balanced.” If thebridge is balanced with Rvar = 9.00 Ω, find (a) the value ofthe unknown resistance R and (b) the current in the 1.00 Ωresistor. (Hint: With the bridge balanced, the wire through theammeter can effectively be removed from the circuit, leavingtwo pairs of resistors in parallel.)(10%) Problem 10: Consider a circuit shown in the figure. Ignore the internal resistances of the batteries. Randomized Variables E = 22 V E2 = 16 V R1= 3 N R2= 42 R3 = 6 2. R3 A 3, F R1 E 1. R2 D * 14% Part (f) Calculate the numerical value of I, in A. Iz = 6.61 X Attempts Remain Feedback: Use the proper number and placement of parentheses. * 14% Part (g) Calculate the numerical value of I, in A. I; = 7.08 X Attempts Remain BThermistor is a resistive temperature element made from semiconductor materials such as oxides of chromium, manganese, iron and cobalt. General equation of the thermistor is: Re = K exp () where, Re is the resistance at 0 Kelvin (273 K=0 °C) and K, ß are constants. Thermistor A has an input temperature ranging from 0 °C to 80 °C. Illustrate a deflection bridge when the output voltage varied from 0 to 2.0V. Given that constant K and ß are 0.06 and 3200.
- Car batteries are rated by the following twonumbers: (1) cranking amps = current the battery can produce for30.0 seconds while maintaining a terminal voltage of at least 7.2 Vand (2) reserve capacity = number of minutes the battery can produce a 25-A current while maintaining a terminal voltage of at least10.5 V. One particular battery is advertised as having 905 crankingamps and a 155-minute reserve capacity. Which of these two ratingsrepresents the greater amount of energy delivered by the battery?A certain voltage regulator has a 12 V output when there is no load (IL =0). When there is a full-load current of 10 mA, the output voltage is 11.9 V. Express the voltage regulation as a percentage change from no-load to full-load and also as a percentage change for each mA change in load current.Question 8. A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of the secondary coil are 24, then the number of turns of the primary are ______.