If the voltage across a circuit of constant resistance is ...

[Kikoku]

If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will
 
  A) be four times as large.
  B) be two times as large.
  C) decrease to one-half the original power.
  D) decrease to one-fourth the original power.

Question 2

An 920-g piece of iron at 100C is dropped into a calorimeter of negligible heat capacity containing 50 g of ice at 0C and 92 g of water, also at 0C.
 
  What is the final temperature of the system? The specific heat of iron is 448 J/kg  K, that of water is 4186 J/kg  K, and the latent heat of fusion of water is 33.5  104 J/kg.
  A) 0C
  B) 11C
  C) 14C
  D) 24C
  E) 32C

[Sophiapenny]

Answer to Question 1

A

Answer to Question 2

D