Physics
Grade-9
Easy

Question

An electrician installs patio lights in a back yard. Which of the following will increase the efficiency of the wiring system to the back yard?
1-     Bury the extension cord deep underground.
2-     Use a shorter extension cord.
3-     Use a longer extension cord.
4-     Use compact fluorescent patio lights

  1. 1 and 2
  2. 1 and 3
  3. 2 and 4
  4. 3 and 4

hintHint:

2 and 4

The correct answer is: 2 and 4


    Shorter extension cord is advisable because extension cord has resistance and more length means more resistance .so, we should use the short extension cord possible
    Compact Fluorescent patio lights should be used to increase efficiency as it utilises less electricity while burning brighter.

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