Quality used in the circuit and how it measured

1. Electrical charge (Q)
2. Electromotive Force (emf)
3. The voltage drop across the load(Vd)
4. Ampere(A)
5. Resistance(R)

1:Electrical charge (Q)
        Electric charge is a physical property of matter which causes objects to experience a force when it is placed in an electric field

When current flows, electrical work is done and energy is transferred. The amount of charge passing a point in the circuit can be calculated using the equation:

charge = current × time

$$Q=I\times t$$

Example

A current of 2 amps (A) flows through a simple electrical circuit.

How many coulombs of charge will flow in 30 seconds?

Q=I×t 

Q=2×30

Q=60C

Where I= Current(A) and t= time

2:Electromotive Force (emf)

         Electromotive Force is the amount of energy delivered per unit of electric charge by a power source such as a generator or a battery (abbreviated E or EMF)

Emf equation

ε=E/Q

Where ε=electromotive force, E=energy(Watt), and Q=Coulombs

3:Voltage drop

      Voltage drop is the decrease of electrical potential along the path of a current flowing in an electrical circuit.

One of the basic principles of electrical engineering is Ohm’s law, which states that the voltage drop across a conductor or load is equivalent to the product of current and resistance (V = I x R). The electric current is determined by the load on a circuit, while resistance is determined by the physical properties of the conductor.

Quiz

Through a circuit, a current of 12A flows through that carries a resistance of 20 Ω. Find the voltage drop across the circuit..

4:Ampere

     An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor. Ampere is measured by Ameter.

Amps = Watts / Volts

Resistance.

Resistance is a measure of the opposition to current flow in an electrical circuit