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- Does a photovoltaic cell obey Ohm’s Law? Explain brieflyDo 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.)Integrated Concepts (a) What is the cost of heating a hot tub containing 1500 kg of water from 10.0°C to 40.0°C, assuming 75.0% efficiency to account for heat transfer to the surroundings? The cost of electricity is 9 cents/kW h. (b) What current was used by the 220-V AC electric heater, if this took 4.00 h?
- A copper wire 100m long with cross-sectional area of 2x10 -4 cm 2 isheated from room temperature of 25 0 C to 200 0 C. Find e) The power dissipated by resistor.Solar panels are rated by their theoretical maximum output capacity. A 2-kW PV panel would theoretically produce 2 kW of electricity at its maximum output (during peak solar radiance). If the average daily peak sun-hours in Philadelphia are approximately 4.0 hr and a rowhome is outfitted with 10 PV panels each having a capacity of 260 W, how much energy (kilowatt x hours) would be generated in one year (in units of kWh/year)?A copper transmission cable 34 km long and 19.5 cm in diameter carries a current of 11 A. How much electrical energy (in MJ) is dissipated as thermal energy in 9 hours? Note: = 1.72x10-8 m show the complete and organize solution and dont round off show the final asnwer in 4 decimal places if possible
- A 660-W electric heater is designed to operate from 120-V source. What is the approximate rate of the development of heat, in cal/sec?please help me know how to convert 89.586 Watts (W) to Joule/second (J/s) thank you1. A 40-W bulb is used for 12.5 hours every day for 30 days. Calculate the consumption of electrical energy.
- 3. A certain copper wire has a resistance of 25 ohms at 10°C.Take the temperature coefficient at 10°C to be 0.00409deg/C. What must be the maximum operating temperatureof the wire if its resistance is to increase by at most 20%?State the relationship between temperature and resistance for a thermistor.1. Calculate the (a) resistivity and the (b) conductivity of a material that has a lengthof 15 m and a cross-sectional area of 5 × 10–8 m2 and a resistance (R) of 5 Ω.
