#6 a toaster with nichrome heating... A tungsten rod is 50.0 cm long and has a s
ID: 1356022 • Letter: #
Question
#6 a toaster with nichrome heating... A tungsten rod is 50.0 cm long and has a square cross-section with sides 1.0 mm. What is its resistance at 20 degree C? What is its resistance at 40 degree C?). A toaster with a Nichrome heating element has a resistance of 80.0 Ohm at 20.0 degree C. At the instant it is turned on, the current is 1.50 A. When the heating element reaches its final temperature, the current is 1.30 A. What is the final temperature of the heating element? A 10.0 k-ohm carbon resistor to be used in an electronic circuit is rated at 0.250 W. What maximum current can this resistor carry? What maximum voltage can be placed across this resistor? A battery has an emf of 12.0 V. How much work does it do in 5.00 s if it delivers a current of 3.00 A? A physics student runs a 1200 W electric heater constantly in her basement bedroom during the winter time. If electricity costs 9 cents per kilowatt-hour, how much does the electric heating cost per month (30 days)? A 12 V automobile battery with negligible internal resistance can deliver a total charge 160 A-h. What is the total energy stored in the battery? How long could this battery provide 150 W to a pair of headlights?Explanation / Answer
Initial Resistance =80.0
Initial Current = 1.5A
V = I* R
V = 1.5*80 Volt = 120 Volt
Final Current = 1.3A
Final Resistance = V/I = 120/1.3 = 92.3
Now, Resistance is proportional to the temperature change and is give by -
R = Rf - Ri = 92.3-80 = 12.3
Resisitivity of Nichrome, = 4.5*10^-4
R/Ri = *T
T = (12.3/80)/(4.5*10^-4)
Tf - Ti = 341.67 oc
Tf = 20 + 341.67
Final Temperature, Tf = 361.67o C
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.