Physics
Grade-9
Easy

Question

Which is cheaper?

  1. Incandescent bulb
  2. Halogen bulb
  3. CFL
  4. All of them have same price

hintHint:

  • Lower the efficiency  cheaper the price 

The correct answer is: CFL


    • Lower the efficiency  cheaper the price 
    •  efficiency of Halogen is lowest
    • Generally, the cheapest light bulbs to buy are halogen – however they tend to have the highest lifetime cost. It's easy to buy a cheap halogen as low as $3, compared to an equivalent CFL at around $6 and LED at $10.

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