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प्रश्न
State whether a solar cell produces a.c. or d.c.
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उत्तर
Solar cell produces d.c. (direct current).
संबंधित प्रश्न
(i) The conversion of part of the energy into an undesirable form is called ______________.
(ii) For a given height h, __________________ the length l of the inclined plane, lesser will be the effort required.
Name five different forms of energy.
Name the type of energy (kinetic or potential) possessed by the following:
A compressed spring.
A boy of mass m climbs up a staircase of vertical height h.
(a) What is the work done by the boy against the force of gravity?
(b) What would have been the work done if he uses a lift in climbing the same vertical height?
State the work energy theorem.
A light mass and a heavy mass have equal momentum. Which will have more kinetic energy?
(Hint : Kinetic energy K = P2/2m where P is the momentum.)
State the energy changes in the following case while in use:
an electric bulb
Give one example when:
Light energy changes to chemical energy.
Give one example when:
Potential energy changes to electric energy.
What is the difference between the solid, liquid, and gaseous states of a substance?
