Question

What does a light bulb marked 100 W mean? (A) Uses 100 A of energy per second. (B) Uses 100 J of current per second. (C) 100 C of charge flows through the bulb per second. (D) Uses 100 V battery (E) none of these.

Answer 1

Answer:

(E) none of these.

Explanation:

first that all we need the meaning of a Watt

" is a unit of power. In the International System of Units (SI) it is defined as a derived unit of 1 joule per second,[1] and is used to quantify the rate of energy transfer."  

definition taken from wikipedia.org

now with this concept we have that:

100 W means 100 J/s .Therefore it uses 100 J energy per second

therefore on the answers don't mention this three terms together

Joules, energy and second so the answer must be.

(E) None of these