Physics
Grade-9
Easy

Question

What is the efficiency of a CFL?

  1. Less than 10 %
  2. More than 15%
  3. Between 10% and 15%
  4. Cannot say

hintHint:

CFL lamps have lighting efficiency ranges of 7–10%, versus 1.5–2.5% for incandescents.

The correct answer is: More than 15%


    • energy input = useful energy output + waste energy
    • Efficiency (%) = (useful energy output ÷ energy input) × 100
    • The luminous efficacy of a typical CFL is 50–70 lumens per watt (lm/W) and that of a typical incandescent lamp is 10–17 lm/W. Compared to a theoretical 100%-efficient lamp (680 lm/W), CFL lamps have lighting efficiency ranges of 7–10%, versus 1.5–2.5% for incandescents.
    • So Its Less than 10%

    Related Questions to study

    Grade-9
    Physics

    What is the efficiency of a halogen bulb?

    What is the efficiency of a halogen bulb?

    PhysicsGrade-9
    Grade-9
    Physics

    What is the cost a tenant will pay if the meter reading was initially 0000 and now it is as shown in the image? Cost per unit is 8 Rs.

    What is the cost a tenant will pay if the meter reading was initially 0000 and now it is as shown in the image? Cost per unit is 8 Rs.

    PhysicsGrade-9
    Grade-9
    Physics

    A family has a record of 09877 for the previous electric bill, and the current bill reads 09897 for the consumption in one month. What is the total electric consumption of the family?

    A family has a record of 09877 for the previous electric bill, and the current bill reads 09897 for the consumption in one month. What is the total electric consumption of the family?

    PhysicsGrade-9
    parallel
    Grade-9
    Physics

    What is the meter reading?

    What is the meter reading?

    PhysicsGrade-9
    Grade-9
    Physics

    What is the meter reading?

    What is the meter reading?

    PhysicsGrade-9
    Grade-9
    Physics

    Which is the correct reading of the electric meter?

    Which is the correct reading of the electric meter?

    PhysicsGrade-9
    parallel
    Grade-9
    Physics

    When the pointer is in between two numbers in an electric meter, which will be recorded?

    When the pointer is in between two numbers in an electric meter, which will be recorded?

    PhysicsGrade-9
    Grade-9
    Physics

    Which number needs to be ignored in a digital meter?

    Which number needs to be ignored in a digital meter?

    PhysicsGrade-9
    Grade-9
    Physics

    How many dials are there in an analog electric meter whose reading is considered?

    How many dials are there in an analog electric meter whose reading is considered?

    PhysicsGrade-9
    parallel
    Grade-9
    Physics

    Identify the given meter.

    Identify the given meter.

    PhysicsGrade-9
    Grade-9
    Physics

    Identify the given meter.

    Identify the given meter.

    PhysicsGrade-9
    Grade-9
    Physics

    Identify the given meter.

    Identify the given meter.

    PhysicsGrade-9
    parallel
    Grade-9
    Physics

    Which number needs to be ignored in a standard mechanical meter?

    Which number needs to be ignored in a standard mechanical meter?

    PhysicsGrade-9
    Grade-9
    Physics

    How will you read a standard mechanical meter?

    How will you read a standard mechanical meter?

    PhysicsGrade-9
    Grade-9
    Physics

    What does an electric meter measure?

    What does an electric meter measure?

    PhysicsGrade-9
    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.