91影视

Heating element is part of electric heating appliance in which electric energy is transformed into heat.

heating element power =4.1kW

connected line voltage =240V

(a)

current is given as,

I=$\frac{p}{v}$

Put values of P and V in I,

I$=\frac{p}{v}=\frac{4.1脳{10}^{3}W}{240V}=$17.08A

Thus, the current in the heating element is I=17.08 and safe for 12-gauge wire.

(b)

Power dissipated is given as,

P= $\frac{v^2}{R}$ (1)

Put all the values in equation (1),

$R=\frac{v^2}{p}=\frac{240脳240}{4100}=14ohms$

Thus, the resistance of the dryer鈥檚 heating element at its operating temperature is R=14ohms

(c)

dryer costs 11 cent for energy of 1kWh.energy consumed by dryer is,

E=pt.=(4.1kW) (1h) =4.1kWh

Cost of operating dryer is,

Cost= (11 cent) (4.1kWh) =45.1cent

Thus, cost per hour to operate the dryer is 45.1cent