Class 10 Physics Electricity Measurement of Electric Current

Measurement of Electric Current

Ammeter is an instrument used to measure electric current. It is always connected in series in a circuit.

  • SI Unit of electric charge is Coulomb (C).Charge is usually denoted by letter Q.
  • SI Unit of electric current is Ampere (A).Current is usually denoted by letter I.

I = Q/t, which means current is net charge flowing through a cross-section in time t.

Hence,  1 A = 1 C/ 1s.

  • 1 Coulomb is equivalent to 6 X 1018 So an electron possess negative charge of 1.6 X 10-19 C.

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