Physics
The group of solar cells joined together in a definite pattern is called a

Solar cooker
Solar cell panel
Battery
Solar heater

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Can be of any shape
Should be made of a good conductor but can be of any shape
Should be in the form of a vertical rod
Should be made of a good conductor like copper with sharp-pointed edges

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Physics
Circuit breaker usually operate under

Steady state of short-circuit current
After D. C. component has ceased
Transient state of short-circuit current
Sub-transient state of short-circuit current

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