Explain the construction and working of
- explain the construction and working of led
- explain the construction and working of ferryu0026#39;s black body
- explain the construction and working of ruby laser
- explain the construction and working of a pinhole camera
- explain the construction and working of an electric bell
- explain the construction and working of daniell cell
- explain the construction and working of a hydrometer with diagram
- explain the construction and working of solar cell
- explain the construction and working of transformer
- explain the construction and working of electric motor
