vork done by a body is e
Hy is generated in the following
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Essay type Questions ....
2. what is enerov? Prove that the work done by a
timal kinetic energy?
2. What is electrical energy? How electricity is de
fa) Hydroelectric power plant
(b) Wincimill power plant
(c) Solar power plant.
3. The total energy of an ideal simple pend
calculating the energy of simple pendu
3. Explain the various energy dissipations which
be done to reduce these dissipations?
5. Prove that the total mechanical energy remains conse
mation What
hidulum remains conserved. Prove the above
at various positions
s which take place during energy transformation
as conserved during a free fall of a body
E Numerical Problems.................
7. Find out the kinetic energy of an electron moving with as
9.1 x 10 57 kg.
2. Find out the work done by a machine in lifting a mass of 40 kr
oving with a speed of 1.2 X 10" m/s. Mass of el.
9.8 ms
a mass of 40 kg to a height of 10 m. (g = 9.8
Ans. 3.92
ential energy ott
9 - 10 m
3. A body of mass 6 kg falls down from a height of 5 m. Calcul
body
4. A spring has a constant 4 x 10' N/m. How much work has to be
eight of 5 m. Calculate the change in pote
0.04 m
rk has to be done to compress it by 0.04
Ans. 32
5. 0.4 J work is done in a spring for streching at distance of 0.02 m, the
nce of 0.02 m, then find out the spring consi
Ans. 2x 10'N
to a height of 50 min 10 sec.
6. Find out the power of an engine if it lifts a load of 200 kg to a height of
(g = 10 m/s?)
Ans. 10 kW
7. In a house, five appliances are used for 10 hours daily. If two appliance
three appliances are of 400 W each, then calculate the electrical energy
are of 200 W each an
appliances in one day.
consumed by the
5. A force is applied on a mass of 40 kg to increase its velocity from 2 m/s to
Ans. 16 units
done by the force.
(Ans. 42031
city from 2 m/s to 5 m/s. Find out the wo
Answers
Answer:
Edit
Electrical energy is energy derived from electric potential energy or kinetic energy. When used loosely, electrical energy refers to energy that has been converted from electric potential energy. This energy is supplied by the combination of electric current and electric potential that is delivered by an electrical circuit (e.g., provided by an electric power utility). At the point that this electric potential energy has been converted to another type of energy, it ceases to be electric potential energy. Thus, all electrical energy is potential energy before it is delivered to the end-use. Once converted from potential energy, electrical energy can always be called another type of energy (heat, light, motion, etc.).
Electrical energy is usually sold by the kilowatt hour (1 kW·h = 3.6 MJ) which is the product of the power in kilowatts multiplied by running time in hours. Electric utilities measure energy using an electricity meter, which keeps a running total of the electric energy delivered to a customer.
Explanation:
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