What are Three Important Electrical Quantities? तीन महत्वपूर्ण विद्युत मात्राएँ क्या हैं

Three Important Electrical Quantities
1. Voltage  - which is measured in volts
2. Current  - which is measured in ampere
3. Resistance - which is measured in ohms

Electric Current(I):

• Electric current means, a flow of electric charge (a phenomenon) or the rate of flow of electric charge (a quantity). The SI unit for measuring the rate of flow of electric charge is the ampere. Electric current is measured using an ammeter.

Voltage(V):

• The voltage between two points is the electrical force that would drive an electric current between those points.
• Voltage can be measured by a voltmeter. The unit of measurement is the volt.

Voltage can be produced by two ways i.e.,

·         Electromotive Force or Electron  Moving Force (emf)

·         Potential Difference

These two ways are responsible for the pushing and pulling of electrons or electric current through a circuit.

Electro-magnetic force(E.M.F):

• Electromotive force (emf) is a driving force that causes current to flow through a circuit. Electromotive force is also known as voltage, and it is measured in volts.

Potential Difference:

• The difference in electric potential between two points in an electric field; the work that has to be done in transferring unit positive charge from one point to the other, measured in volts.

Resistance(R)

• Resistance is the ratio of potential difference across a conductor to the current flowing through it (or) It is the amount opposition offered to the flow of electrons.It’s unit is ohms.
• Resistivity (ρ): The electrical resistance per unit length, area, or volume of a substance is known as resistivity. The formula relating resistivity (ρ) to resistance (R), cross-sectional area (A) and length (L) is:
• Reactance (X): It is a property to oppose change in current or alternating current. In an AC circuit, the resistance and reactance combine vectorially to yield impedance.