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प्रश्न
State two disadvantages of producing electricity from solar energy.
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उत्तर
Disadvantages of using solar panels:
1. The initial cost of a solar panel is sufficiently high.
2. The efficiency of conversion of solar energy to electricity is low.
3. A solar panel produces d.c. electricity which cannot be directly used for many household purposes.
संबंधित प्रश्न
How many MeV are equivalent to 1 atomic mass unit (u)?
Give one relevant example for the following transformation of energy :
Chemical energy to light energy.
Name the type of energy (kinetic energy K or potential energy U) possessed in the given case:
A stretched wire
Give one disadvantage of using a solar cell.
MULTIPLE CHOICE TYPE:
The ultimate source of energy is:
(a) wood
(b) wind
(c) water
(d) sun
A ball of mass 0.5 kg slows down from a speed of 5m/s-1 to that of 3m/s-1. Calculate the change in kinetic energy of the ball.
Write the type of energy possessed in the following case:
A wound-up spring
Give one example when:
Electric energy changes to potential energy.
A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
