Our main aim is to transfer the energy from one point to another point and for this we required an interconnection between the electrical element and component is called as an electrical circuit.
Charge- It is an electrical property of the atomic particals of which the metal consist of & its unit is columb.
Hence 6.2×10^18e-sec electrons are required just for 1columb of charge.
Low of conservation of charge- "It states that charge can neither be created nor be distroied it can only be transferred one body to another body".
Current- The flow of the electrons or the time rate of change of charge is called as
current and its unit is amp.
Conventionally the direction of the current flow is taken in the direction of the +ve charge movement.
Voltage- To move the electron from one point to another point in a perticular direction an external force is required and in an electrical circuit this force is provided by the electro motive force or emf and it is given by
Voltage- To move the electron from one point to another point in a perticular direction an external force is required and in an electrical circuit this force is provided by the electro motive force or emf and it is given by
If we place a +ve charge an electric field it get accelerating in the direction of field just like when a mass is placed in the gravitational field it get accelerating in the direction of field.

Higher potential- Lower potential= -5
VA-VB= -5
VA=VB - 5
Power- It is the time rate of change of energy (expending or absorbing) & its unit is watt.

P(t)= v(t).i(t)
Current direction and voltage polarity are important in determining the sign of power.
When current enter into the +ve terminal than the element absorbed the power.
When current leaves from the +ve terminal than the element delivered the power.









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