CBSE Class 10 Science Notes Chapter 12 Electricity

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Questions and Answers

What is the flow of electric charge known as?

  • Electric potential
  • Resistance
  • Voltage
  • Electric current (correct)

By convention, in which direction does electric current flow?

  • In a random direction
  • In a circular direction around the conductor
  • In the opposite direction to the movement of electrons (correct)
  • In the same direction as the movement of electrons

What does the rate of flow of electric charges mean?

  • The amount of charge flowing through a particular area in unit time (correct)
  • The amount of charge in a conductor
  • The amount of charge flowing through a closed path
  • The amount of charge at rest

What is denoted by the letter 'I' in the expression of electric current?

<p>Electric current (C)</p> Signup and view all the answers

What does 'Q' represent in the expression for electric current?

<p>Net charge (B)</p> Signup and view all the answers

What does 't' represent in the expression for electric current?

<p>Time in seconds (A)</p> Signup and view all the answers

What is the SI unit of electric charge?

<p>Coulomb (B)</p> Signup and view all the answers

Which unit is used to express small quantities of electric current?

<p>Milliampere (A)</p> Signup and view all the answers

What is the SI unit of electric potential difference?

<p>Volt (B)</p> Signup and view all the answers

What is the amount of electric potential energy at a point called?

<p>Electric potential (A)</p> Signup and view all the answers

What is the difference in the amount of electric potential energy between two points in an electric circuit called?

<p>Electric potential difference (B)</p> Signup and view all the answers

What is the flow of electric charge through a surface at the rate of one coulomb per second called?

<p>Ampere (D)</p> Signup and view all the answers

What is the S.I. unit of electric current?

<p>Ampere (C)</p> Signup and view all the answers

What is the charge acquired by a glass rod when rubbed with silk called?

<p>Positive charge (D)</p> Signup and view all the answers

What does an ammeter measure in a circuit?

<p>Electric current (A)</p> Signup and view all the answers

What are small quantities of electric current expressed in?

<p>Milliampere and microampere (A)</p> Signup and view all the answers

Flashcards

Electric Current

The flow of electric charge.

Conventional Current Flow

The direction opposite to the flow of electrons.

Rate of Electric Charge Flow

The amount of electric charge passing through a specific area in a given time.

Electric Current Symbol

The symbol 'I' represents electric current.

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Net Charge Symbol

Represents the net amount of charge flowing in the expression for electric current.

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Time Symbol

Represents time in seconds in the expression for electric current.

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Coulomb

The standard unit of electric charge.

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Milliampere

A unit used to express small quantities of electric current.

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Volt

The standard unit of electric potential difference.

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Electric Potential

The amount of electric potential energy at a particular point.

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Electric Potential Difference

The difference in electric potential energy between two points in a circuit.

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Ampere

One coulomb of charge flowing through a surface each second.

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Ampere (SI Unit)

The SI unit of electric current.

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Positive Charge

The charge acquired by a glass rod when rubbed with silk.

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Ammeter

A device used to measure electric current in a circuit.

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Milliampere and Microampere

Units used to express small quantities of electric current.

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Study Notes

Electric Charge and Electric Current

  • The flow of electric charge is known as electric current.
  • By convention, electric current flows in the direction of positive charge flow, from positive to negative terminals.

Electric Current Expression

  • The rate of flow of electric charges refers to the amount of electric charge that flows through a given area per unit time.
  • The letter 'I' denotes electric current in the expression.
  • 'Q' represents the amount of electric charge in the expression for electric current.
  • 't' represents time in the expression for electric current.

Units of Electric Charge and Current

  • The SI unit of electric charge is the coulomb (C).
  • Small quantities of electric current are expressed in milliamps (mA) or microamps (μA).
  • The SI unit of electric current is the ampere (A), which is one coulomb per second.

Electric Potential Energy and Potential Difference

  • The amount of electric potential energy at a point is called electric potential.
  • The difference in the amount of electric potential energy between two points in an electric circuit is called electric potential difference.

Measurement and Expression

  • An ammeter measures electric current in a circuit.
  • Small quantities of electric current are expressed in milliamps (mA) or microamps (μA).

Electric Charge Properties

  • When a glass rod is rubbed with silk, it acquires a positive electric charge, known as static electricity.

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