Explain the working of LED.

Explain the working of an ink dropper.

Explain the working of hydraulic brakes.

Explain the working of an atomizer.

Explain the working of a heat engine.

Explain the working of a venturimeter.

Explain the working of an n-p-n transistor?

Explain the working of an astronomical telescope using refraction of light.

Explain the working of a refrigerator with energy flow diagram?

Explain the following with the help of a diagram: Explain the working of an astronomical telescope using refraction of light.

Explain the working of the cyclotron and find the expression for the time period of revolution of the charged particle.