The current through a certain heater wire is found to be fairly independent of its temperature. If the current through the heater wire is doubled, the amount of energy delivered by the heater in a given time interval will:.a) increase by a factor of two. b) decrease by a factor of two. c) increase by a factor of four. d) decrease by a factor of four. e) increase by a factor of eight.

(c) increase by a factor of four

Explanation:

the formular for the relationship between  energy and current is E= I²Rt (Heat energy)

the heater is fairly independent of its temperature , and given the time to be constant.

with the current being doubled,

E = I² Rt

E/ I² = K

=

E2 =

I2 = 2* I1

E2 =  E1 * 4*I1² / I1²

dividing , we have that  E2 = 4 * E1

which means during the same time interval the amount of energy will increase by a factor of four.

3. dark matter

empty space could also be a simple vacuum