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- 1. What happened to the voltage across the resistance box as the current through it was increased? What is the relationship between voltage and current when resistance is fixed? 2.What is the current in a 10 ohms resistor due to a potential difference of 40 V? Explain.How does the resistance for copper and for silicon change with temperature? Why are the behaviors of these two materials different?Do impurities in semiconducting materials listed in Table 9.1 supply free charges? (Hint Examine the range of resistivity for each and determine whether die pure semiconductor has the higher or lower conductivity.)
- #2: Two wires of the same length and cross-section, one made of copper and the other made of aluminum, are connected in parallel to a voltage source. Which one will be hotter after 30 seconds? What happens if you connect them in a series? Explain in words. (Paluminum = 2.8 x 10^-8 Ωm, Pcopper = 1.7 x 10^-8 Ωm)What is the voltage across the 10k resistor? What is its current? What is the current through the 4k and 6k resistors? What is the voltage across the 4k resistor? 6k resistor? What is the sum of the voltages across the 4k and 6k resistors? What is the Req of the circuit? What is the current of the 10V source?1) A resistor has a value of 20 ohms (Ω) when it is at 15 degrees Celsius. If the coefficient of thermal resistivity is 3.5 x 10-3/ Celsius, determine the value of the resistance at 97 degrees Celsius. Write your result to 3 significant figures. 2) A certain copper wire has a resistance of 10.0 ohm (Ω). a) At what point should the wire be cut so that the resistance of one segment is 4 times the resistance of the other segment? b) What is the resistance of each segment?
- A photoresistor, whose resistance decrease with light intensity is connected in the circuit of the figure below. On a sunny day, the photoresistor has a resistance of 0.56 kΩ. On a cloudy day, the resistance rises to 4.0 kΩ. At night, the resistance is 20 kΩ. 8 (i) What does the voltmeter read for each of these conditions? (ii) Does the voltmeter reading on the 1 kΩ resistor increase or decrease as the light intensity increases on the photoresistor? Why?A new material is found to be superconducting below 77 K. How much resistance will a 75 mm long sample of this material have if it is at a temperature of 69.3 K while connected to a 6.4 V AC-power supply? R = How much thermal energy will it generate?Thermal energy generated =Two batteries with emf’s of 1.5 V and 1.2 V and internal resistances of 0.50 : and 0.80 :, respectively, are connected in parallel with + terminals together. (a) Determine the current they would deliver to an external resistance of 2.0 :. Hint, this circuit is equivalent to the two loop circuit you just investigated above! Would more current be delivered if only one battery were used? If so, which one? Explain
- Calculating the Cost Effectiveness of Compact Fluorescent Lights (CFL)If the cost of electricity in your area is 12 cents per kWh, what is the total cost (capital plus operation) of using a 60-W incandescent bulb for 1000 hours (the lifetime of that bulb) if the bulb cost 25 cents? (b) If we replace this bulb with a compact fluorescent light that provides the same light output, but at one-quarter the wattage, and which costs $1.50 but lasts 10 times longer (10,000 hours), what will that total cost be?Hi, Sketch i0 and v01 for the network below for the input shown (Both diodes are Si. VD=0.7 V) Can you briefly explain your drawings1. What is the equivalent resistance if you connect three 10.0 Ω resistors in series? 2. What is the equivalent resistance if you connect three 10.0 Ω resistors in parallel? 3. Calculate the current in each 10.0 Ω resistor in the series circuit and in the parallel circuit if the power supply is 60.0 V.