The heating element in a toaster is made of Nichrome wire. Immediately after the
ID: 1644400 • Letter: T
Question
The heating element in a toaster is made of Nichrome wire. Immediately after the toaster is turned on, is the current (I_rms) in the wire increasing, decreasing, or staying constant. Explain. An electric clothes dryer has a heating element with a resistance of 9.6 Ohm. (a) What is the current in the element when it is connected to 240 V? (b) How much charge passes through it in 50 minutes? A bird stands on a dc electric transmission line carrying 2800 A. The line has 2.5 times 10^-5 ii resistance per meter, and the bird's feet are 4.0 cm apart. What is the potential difference between the bird's feet? Can a 2.5 mm diameter copper wire have the same resistance as a tungsten wire of the same length? Support by calculating values. A 100 W lightbulb has a resistance of about 12 ii when cold (20 degree C) and 140 Ohm when on (hot). Estimate the temperature of the filament when hot assuming an average temperature coefficient of resistivity alpha = 0.0060 degree C^-1. A 120 V hair dryer has two settings: 850 W and 1250 W. (a) At which setting do you expect the resistance to be higher? After making a guess, determine the resistance at (b) the lower setting and (c) the higher setting.Explanation / Answer
7. as the toaster is turned on, it starts heating so resistance would increase so current would decrease.
so the answer is decreasing
1. a) current = v/R = 240/9.6 = 25A
b) charge = current * time = 25A * 50 * 60 seconds= 75000 Coulombs
2. R = 2.5 * 10-5 ohm per m* 0.04 m = 1* 10-6 ohms
potential difference = I * R = 2800 * 10-6 = 0.0028 V
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