RRB ALP Stage-2 exam: Physics notes- CURRENT ELECTRICITY (PART 6)

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Looking forward to providing you the best apt study content for every government exam at no cost thus making access to the exam content convenient for you, SSCADDA is available once again to assist you thoroughly in Railway ALP Stage 2 Exam 2018 where the motive is to enable you with Physics detailed notes on definitions, concepts, laws, formulae, rules and properties, important from the exam point of view. Stay in tune with SSCADDA to utilize the remaining time for Railway ALP Stage 2 and maximize your practice skills.


Electric circuit: The closed path along which electric current flows is called an electric circuit.

Conventional symbols used to represent some of the most commonly used electrical components are given:

Positive and negative charges: The charge acquired by a glass rod when rubbed with silk is called positive charge and the charge acquired by an Ebonite rod when rubbed with wool is called negative charge.

Static and current electricity: Static electricity deals with the electric charges at rest while the current electricity deals with the electric charges in motion.

Conductor: A substance which allows passage of electric charges through it easily is called a conductor. A conductor offers very low resistance to the flow of current. For example copper,silver, aluminium etc.

Insulator: A substance that has infinitely high resistance does not allow electric current to flow through it. It is called an insulator. For example rubber, glass, plastic, Ebonite etc.

Coulomb’s Law: The mutual electrostatic force between two point charges q₁ and q₂ is proportional to the product q₁ q₂ and inversely proportional to the square of the distance r₂₁ separating them.

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