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- Check Your Understanding A strain gauge is an electrical device to measure strain, as shown below. It consists of a flexible, insulating backing that supports a conduction foil pattern. The resistance of the foil changes as the backing is stretched. How does the strain gauge resistance change? Is the strain gauge affected by temperature changes?An electronic device designed to operate at any temperature in the range from 10.0C to 55.0C contains pure carbon resistors. By what factor does their resistance increase over this range?Ralph has three resistors, R1, R2, and R3, connected in series. When connected to an ideal emf source E1, current I1 flows through the resistors. a. If the resistors are instead connected to a second source with E2=2E1, what is the new current through the resistors in terms of the first current? b. Show that, if each resistance is doubled and the resistors are connected in series to the second emf source, the current through the resistors is equal to I1.
- A 160F capacitor charged to 450 V is dischargedthrough a 31.2k resistor, (a) Find the time constant.(b)Calculate the temperature increase of the resistor, given that its mass is 2.50 g and its specific heat is 1.67kJ/kg °C,noting that most of the thermal energy is retained in the short time of the discharge, (c) Calculate the new resistance, assuming it is pure carbon. (d) Does this change in resistance seem significant?The networks in parts (a) and (b) of Figure show two resistors coupled in series and in parallel, respectively. We wish to find a general formula for the effective resistance of each network-that is, find Reff such that E = Refl (a) Show that the effective resistance Reff of a network with two resistors coupled in series [Figure 2(a) J is given by Reff=R1+R2 (b) Show that the effective resistance Reff of a network with two resistors coupled in parallel [Figure 2.23(b)] is given by Reff=1/(1/R1+1/R2)Three resistors of 25 Ω, 30 Ω and an unknown resistance R are connected in parallel and thecombination is connected to a 16 V source. If the total current delivered by the source is 1.5 A,determine the following:A. The value of R.B. The current in each resistor.C. Which resistor dissipates the highest power? Show your solution. Based on your answer,what conclusion can be made?
- An ideal battery produces a potential difference of 17.45V and is connected to 4 resistors as shown below. R1 has a resistance of 2.44Ω, R2 has a resistance of 2.43Ω, R3 has a resistance of 3.39Ω, and R4 has a resistance of 1.98Ω. From this arrangement, What is the current through R4?Referencing the picture, Can I ask for an explanation as to why can we measure resistance with a pencil drawn on a piece of paper? What is the component/material that is on the pencil that gives a high resistance? With the values given on the images, what are the corresponding color codes (indicate tolerance using a 4-band color code scheme)? If the first value is connected in series with the other value, what is the total resistance? If it’s parallel what is the total resistance?The interior of thehuman body has an electrical resistivity of 0.15 Ω # m. (a) Estimatethe resistance for current flowing the length of your index finger.(For this calculation, ignore the much higher resistivity of yourskin.) (b) Your muscles will contract when they carry a currentgreater than 15 mA. What voltage is required to produce this current through your finger?
- consider a portable electric blanket that runs on a 1,5 V battery. ıf you use copper wire with a 1 mm diameteras the heating element, how long should the wire be (in units of meters) if you want to generate 10 W of heating power ? (take the resistivity of the copper wire as p = 1,7 * 10-8 ohm*m)Consider a resistor network connected to a 32.0-V battery as shown. The battery has negligible internal resistance. If the equivalent resistance of the resistor network is 6.40 Ω, what is the value of the resistance of one of the resistors?What is the potential difference across the resistor ?What voltage will produce 0.2 AA of current through a 4800-ΩΩ resistor? Express your answer to two significant figures and include the appropriate units. V=