Electricity Class 10 Notes

What is Electricity?

Electricity can be simply defined as the physical flow of electrons or a stream of electrons moving in a conductor to efficiently deliver the energy found in primary sources to end users. Electricity can be created in three ways:

  • Electromagnetic conversion.
  • Chemical reaction.
  • Solid-state conversion.

What is Electric Charge?

Electric charge is the fundamental property of an atom. It is denoted by the letter Q. Positive and negative charge are two types of electric charge. In atoms, protons are the carrier of a positive charge and electron are the carrier of a negative charge. These two types of charges are equal and opposite. Like charge repels each other, whereas unlike charge attract each other. The SI unit of electric charge is coulomb and is denoted by letter C.

What is Electric Current?

Current = Charge / Time ⇒ I = Q / T

Electric Current is defined as the rate of flow of electrical charge. It is denoted by the letter I and the SI unit of electric current is ampere (A) and the instrument used to measure electric current is Ammeter. An electric circuit is a continuous and closed path in which the electric current flows.

Ohm’s Law

According to the Ohm’s law, the electric circuit is directly proportional to the potential differences between the two points.

⇒ i ∝ V

⇒ i = V/R

⇒ V = iR

Where: V= Potential differences

i= Electric circuit

R= Resistance.

Few Important Questions

  • What is electric power?
  • What is the unit of current?
  • Define Conductors and Insulators with examples.
  • What is a voltmeter? Explain, how it is connected in the circuit.
  • Explain why copper and aluminum wires are used for electricity transmission?

Learn more about the Electricity from the topics given below:


Practise This Question

Express 256×243 in exponential form.