1. A 120 V hair dryer has two setting:720W and 1320 W. a. at which setting do yo
ID: 1667221 • Letter: 1
Question
1. A 120 V hair dryer has two setting:720W and 1320 W. a. at which setting do you expect the resistance to behigher720 or 1320. b.After making a guess,determine the resistance at the lowersetting. ans in ohm's. c.After making a guess,determine the resistance at the highersetting.ans in ohm's. 2.The heating elements of a 106V,1650 W heater is 5.3 m long.if it is made of iron,what must be its diameterbe. ans in mm a. at which setting do you expect the resistance to behigher720 or 1320. b.After making a guess,determine the resistance at the lowersetting. ans in ohm's. c.After making a guess,determine the resistance at the highersetting.ans in ohm's. 2.The heating elements of a 106V,1650 W heater is 5.3 m long.if it is made of iron,what must be its diameterbe. ans in mmExplanation / Answer
1. at 720 W is higher. b. We have Power P=U^2/R so R=U^2/P R(720)=120^2/720=20 R(1320)=120^2/1320=10,9. 2.The resistance of the heating element. R=106^2/1650=6,8 Let d be the diameter of the wire. R=*l/S=*l/(d^2/4)=4l/(d^2) so d=sqrt(4l/R)=3,15e-4(m)=0,315mm
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