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Smart presentation
1.Electric current
2.Ohms law
3.Properties of electric charge
Electric charge
 A charge particle is called an ion is an atom
with positive or negative charge.
 When atom losses electron it become a
positively charged
 When an atom gain electron it become
negatively charged.
 The unit of charge is coulomb, represented by
C.
continue
 Same charges repel each other.
 Opposite charges attract each other.
 The sum of identical positive and negative
quantities is zero (0).
 The total charge of a closed system is
constant.
 The universe is a closed system.
 It is the law of conversation of charge.
Electric Current
 The Rate of flow of electric charge is known
as electric current.
 Represented by I.
 The unit of current is Ampere.
 The equation of current is
I=q/t
 Where q is charge in coulombs and t is the
time in second.
continue
 Current due positive charge is known is
conventional current.
 Current due to negative charge is known as
electronic current.
 It is the property of current when it Is passed
from a wire it will produce a magnetic field
around that wire from which it is passed.
Resistor and resistance
 A resistor is an electrical component which
provide opposition to the flow of current.
 Resistance is a measure of the opposition to
current flow in an electrical circuit.
 The unit of resistance is ohm.
 Represented by the greek letter omega(立).
Conductor and Insulator
 Conductors: is a material that offers
low resistance or offers negligible
resistance to the flow of current.
 Examples are Silver copper gold and
aluminum.
 In Conductors electron can move
easily.
continue
 Insulator: is a material that provide high
resistance to the flow of current.
 Insulator restrict the flow of current.
 Example of insulator is Rubber paper glass
wood and plastic.
 Insulators are used in electrical equipment to
support and separate electrical conductors
without allowing current through
themselves.
Electric circuit
 The path to the flow of current is known as
electric current.
 The diagram for electric circuit is shown
below.
 circuit diagram
Electric circuit
 Another diagram for electric circuit is.
Electric circuit
 Ammeter: is a device which measure electric
current in a circuit.
 Ammeter is connected in series with an
electric circuit.
 Voltmeter: is a device which measure the
voltage in the electric circuit.
 Voltmeter is connected in parallel.
Ohms law
 This law states that:
potential difference(voltage)
Across and ideal conductor is proportional to
the current
Ohms law is given by
V = I R
 Temperature should be constant.

Thanks
Ohms law
 The material which obey ohms law is known
as ohmic material.
 Ohms law is not applicable in semiconductor
because when temperature is changed in
semiconductor their property also changed.
 Through ohms law we can find voltage
current and resistance also.

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ohm's law conductor insulator electric circuit ammeter voltmeter

  • 1. Smart presentation 1.Electric current 2.Ohms law 3.Properties of electric charge
  • 2. Electric charge A charge particle is called an ion is an atom with positive or negative charge. When atom losses electron it become a positively charged When an atom gain electron it become negatively charged. The unit of charge is coulomb, represented by C.
  • 3. continue Same charges repel each other. Opposite charges attract each other. The sum of identical positive and negative quantities is zero (0). The total charge of a closed system is constant. The universe is a closed system. It is the law of conversation of charge.
  • 4. Electric Current The Rate of flow of electric charge is known as electric current. Represented by I. The unit of current is Ampere. The equation of current is I=q/t Where q is charge in coulombs and t is the time in second.
  • 5. continue Current due positive charge is known is conventional current. Current due to negative charge is known as electronic current. It is the property of current when it Is passed from a wire it will produce a magnetic field around that wire from which it is passed.
  • 6. Resistor and resistance A resistor is an electrical component which provide opposition to the flow of current. Resistance is a measure of the opposition to current flow in an electrical circuit. The unit of resistance is ohm. Represented by the greek letter omega(立).
  • 7. Conductor and Insulator Conductors: is a material that offers low resistance or offers negligible resistance to the flow of current. Examples are Silver copper gold and aluminum. In Conductors electron can move easily.
  • 8. continue Insulator: is a material that provide high resistance to the flow of current. Insulator restrict the flow of current. Example of insulator is Rubber paper glass wood and plastic. Insulators are used in electrical equipment to support and separate electrical conductors without allowing current through themselves.
  • 9. Electric circuit The path to the flow of current is known as electric current. The diagram for electric circuit is shown below. circuit diagram
  • 10. Electric circuit Another diagram for electric circuit is.
  • 11. Electric circuit Ammeter: is a device which measure electric current in a circuit. Ammeter is connected in series with an electric circuit. Voltmeter: is a device which measure the voltage in the electric circuit. Voltmeter is connected in parallel.
  • 12. Ohms law This law states that: potential difference(voltage) Across and ideal conductor is proportional to the current Ohms law is given by V = I R Temperature should be constant.
  • 14. Ohms law The material which obey ohms law is known as ohmic material. Ohms law is not applicable in semiconductor because when temperature is changed in semiconductor their property also changed. Through ohms law we can find voltage current and resistance also.