Ex. 89: A potentiometer wire of length 10 m and resistance 10 Q is connected in series with a resistance box and a cell of e.m.f 2 V and negligible internal resistance. What resistance must kept in the box if the potential drop across the wire is to be 10 mV ? What is the potential gradient in mV per mm?
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- For each of the three simple circuit boards you will need to calculate the total resistance Reg for the entire circuit board by using the measured resistances of each of the resistors, and the equations given to you in the theory section. Then using the applied voltage of 2V, as the theoretical voltage Vth for the entire circuit board you can calculate the theoretical current, ith, for the entire circuit board. Table 1(Resistors in series) R(Q) 310 10 100 200 Req 10Ω 1000 200Ω iex(A) 0.0074 0.0064 0.068 0.0064 0.650 0.0064 1.283 Using the equations for resistors in series calculate the theoretical voltages, and currents for each of the resistors, and the entire circuit. Use the measured values of the resistance in your calculations. Then calculate the % errors. Show work. Vex(V) 2.006 ith(A) Vth(V) % Error i % Error VQ11. A 16.0V emf automobile battery has a terminal voltage of 12.0 V when being charged by a current of 10.0A. (a) What is the battery's internal resistance?what is the answer!?
- What is the value of the unknown R if the voltage across the 500Ω resistances is 4 V?A wire of length 1.6 m has a resistance 8 ohm is connected to a battery of 2 volts and internal resistance 2 ohm. What is the potential gradient?Dry air is a pretty decent insulator; it has a very high resistivity of 3x10^1302 m. Consider a capacitor that has square plates 15 cm on a side, separated by 0.8 mm of dry air. The capacitor is charged such that it has a potential of 320 V between the plates. 1. First, what is the resistance of the volume of air between the plates in GS2 (to 3 significant digits)? 2. What is the capacitance of this capacitor (in pF to 3 significant digits)?
- Plot the voltage (y-axis) versus current (x-axis) from Table 1 then analyze the shape of the graph.A battery with E=39 V and negligible internal resistance is connected to one's voltage conductor as shown in the figure. R1 and R2 are given. a) What is the voltage U2 if no external load is connected? b)How big will the current be between A and B if these connection points are short-circuited. c) How large is U2 if a load with resistance 68 is connected between A and B? d) What is the power of the circuit if a load with resistance 68 is connected between A and B?A cylindrical wire has a resistance R and resistivity o as in figure (a). If its length L and diameter D are doubled as in figure (b), then its resistivity will now be: