Electricity

Series Circuit The current flow into a resistor = the current flow inside the resistor = the current flows out from the resistor IA = IB = IC In a series circuit, the current at any points of the circuit is the same. Parallel Circuit The current flow into a parallel circuit is equal to … Read more

Finding the Resistance of an Individual Resistor Example 1 Given that the equivalent resistance of the connection in the figure above is 0.8Ω, find the resistance of the resistor R. Answer: Example 2 Given that the equivalent resistance of the connection in the figure above is 4Ω, find the resistance of the resistor R. Answer:

In a series circuit, the more resistors with equal resistance in the circuit, the higher the effective resistance of the circuit. In a parallel circuit, the more resistors with equal resistance in the circuit, the lower the effective resistance of the circuit.

Resistance in Series and Parallel Circuit In a series circuit, the effective resistance is equal to the sum of the individual resistance, as shown in the following equation. In a parallel circuit, the effective resistance of the resistors can be calculated fro the following equation. Example: Find the equivalent resistance of the connection shown in … Read more

Series Circuit and Parallel Circuit The resistors connected in one non-branched wire is said to be connected in series, whereas resistors connected in a branched wire is said to be connected in parallel. In the diagram above, (a), (b) and (c) are series circuit whereas (d), (e) (f) and (g) are parallel circuit.

Resistance The resistance R of a material is defined as the ratio V : I, where V is the potential difference across the material and I is the current flowing in it.  The SI unit of resistance is the ohm (W). One ohm is the resistance of a material through which a current of one … Read more

Relationship Between Current and Potential Difference Ohm’s Law The relationship between the current passing through 2 points in a conductor and the potential difference between the 2 points is given by Ohm’s law. Ohm’s Law states that the current flowing in the metallic conductor is directly proportional to the potential difference applied across it’s ends, … Read more

Potential and Potential Difference The electric potential V at a point in an electric field is the work done to bring a unit ( 1 Coulomb) positive charge from infinity to the point. The potential difference (p.d.) between two points is defined as the work done in moving 1 Coulomb of positive charge from 1 … Read more

Current An electric current I is a measure of the rate of flow of electric charge Q through a given cross-section of a conductor. In other words, current is the measure of how fast the charge flow through a cross-section of a conductor. Equation Direction of Current Conventionally, the direction of the electric current is … Read more

Electric Field An electric field is a region in which an electric charged particle experiences an electric force. Electric field is represented by a number of lines with arrows, called electric lines of force or electric field lines. The direction of the field at a point is defined by the direction of the electric force … Read more