physics question

Question

An electric radiator has a resistance of 50.0 Ω.

a) What is the current when it is connected to a 200 V outlet?

 b) What is the power of the radiator?

 c) Calculate the quantity of electrical energy transformed into heat energy when the radiator is operated for 10 minutes.

Answer 1

(a)

 

I = E/R = (200 V)/(50.0 Ω) = 4 A

 

(b)

 

P = IE = (4 A)(200 V) = 800 W

 

(c)

 

ΔU = PΔt = (800 W)(600 s) = 480,000 J