What is the resistance of the heater when it is turned on

Reference no: EM13514614

In her bathroom, Mindy has an overhead heater that consists of a coiled wire made of nichrome that gets hot when turned on. The wire has a length of 2.2 m when it is uncoiled. The heating element is attached to the normal 120-V wiring and when the wire is glowing red hot it has a temperature of about 418° C and dissipates 2120 W of power. Nichrome has a resistivity of 1.08 10-6 m at 20° C and a temperature coefficient of resistivity of 0.00040° C ?1.

(a) What is the resistance of the heater when it is turned on?

(b) What current does the wire carry?

(c) If the wire has a circular cross section, what is its diameter? Ignore the small changes in the wire's diameter and length due to changes in temperature.

___ m

(d) When the heater is first turned on, it has not yet heated up, so it is operating at 20° C. What is the current through the wire when it is first turned on?

___ A

Reference no: EM13514614

Questions Cloud

Define the partial pressure of oxygen gas at equalibrium : At 800 k, Kc for the following equalibrium is 4.2 x 10 ^-3. 2HgO(s) 2Hg(l) + O2(g), suppose 96.5 g of mercury(ll) oxide is placed in a sealed 3.50 vessel at 800 k. What is the partial pressure of oxygen gas at equalibrium

Calculate the speed of water in the nozzle : Water flows at the rate of 3.02 kg/s through a hose with a diameter of 3.08 cm. What is the speed of water in this hose, what is the speed of water in the nozzle

Decision on the financial statements : Write a letter to Uncle Carlos explaining why it would be unwise to base an investment decision on the financial statements that he has provided to you. Be sure to explain why these financial statements are neither relevant nor representationally ..

What recent advance has been found in the grants research : Did Darwin ever see evolution in action? Why or why not? How many people around the world are documenting evolution now? What recent advance has been found in the grant's research?

What is the resistance of the heater when it is turned on : In her bathroom, Mindy has an overhead heater that consists of a coiled wire made of nichrome that gets hot when turned on. The wire has a length of 2.2 m when it is uncoiled. What is the resistance of the heater when it is turned on

Define what is the equalibrium concentration of hi : In an experiment, 0.30 mol H2 and 0.30 mol I2 are mixed into a 1.00-l container, and the reaction forms HI. If Kc =49. for this reaction, what is the equalibrium concentration of HI. I2(g) + H2(g) 2HI(g)

Find the speed of the first glider : Two air-track gliders of equal mass are initially moving in the same direction along a straight line. What is the speed of the first glider (rearmost) after the collision

Discuss the advantages of each method : Expensing the costs of sample display houses in the periods in which the expenditure is made and spreading the costs over more than one period. Discuss the advantages of each method.

What is the angular acceleration of the disk and block : A 4.0 kg block rests at the edge of a disk with a mass of 5.0 kg and a radius of 30 cm. A 2 N force is applied to the edge of the disk. What is the angular acceleration of the disk and block

User Account

All Pages