A certain household has consumed \(250\) \(units\) of energy during a month. How much energy is this in joules?
Solution and Explanation
Energy consumed by a certain household = \(250\) \(kWh\)
since \(1\) \(kWh\) = \(3.6 × 10^6 \;J\)
therefore \(250\) \(kWh\)
= \(250 × 3.6 × 10^6\)
= \(9 × 108\) \(J\).
Top Questions on Energy
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- The correct statements are:
A. Energy payback time (EPBT) should be less than life of PV System
B. Life cycle conversion efficiency (LCCE) should be less than one
C. Energy production factor (CEPF) on life time basis should be more than one
D. Carbon emission is more if electrical power is generated by PV in comparision to the electrical power generated by conventional power plant
Choose the correct answer from the options given below:
Questions Asked in CBSE Class IX exam
- Explain what the reasons for the following are.
(i) Einstein leaving the school in Munich for good.
(ii) Einstein wanting to study in Switzerland rather than in Munich.
(iii) Einstein seeing in Mileva an ally.
(iv) What do these tell you about Einstein?- CBSE Class IX
- A truly beautiful mind
- (i) The kind of person the doctor is (money, possessions)
(ii) The kind of person he wants to be (appearance, ambition)- CBSE Class IX
- The snake and the mirror
In Fig. 9.26, A, B, C and D are four points on a circle. AC and BD intersect at a point E such that ∠ BEC = 130° and ∠ ECD = 20°. Find ∠ BAC.
- CBSE Class IX
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- CBSE Class IX
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Look up the dictionary entries for the words sympathy, familiarity, comfort, care, and surprise. Use the information given in the dictionary and complete the table.
Noun, Adjective, Adverb, Verb, Meaning:
sympathy
familiarity
comfort
care
surprise- CBSE Class IX
- If I were you
Concepts Used:
Work-Energy Theorem
The work and kinetic energy principle (also known as the work-energy theorem) asserts that the work done by all forces acting on a particle equals the change in the particle's kinetic energy. By defining the work of the torque and rotational kinetic energy, this definition can be extended to rigid bodies.
The change in kinetic energy KE is equal to the work W done by the net force on a particle is given by,
W = ΔKE = ½ mv2f − ½ mv2i
Where,
vi → Speeds of the particle before the application of force
vf → Speeds of the particle after the application of force
m → Particle’s mass
Note: Energy and Momentum are related by, E = p2 / 2m.