Electricity

Finding Potential Difference in a Series Circuit In the circuit above, if the current in the circuit is I, then the potential difference across each of the resistor is Example Find the potential difference across each of the resistors in the diagram above. Answer:The potential difference across the 2 resistors, V = 12VThe equivalent resistance … Read more

Finding Current in a Parallel Circuit In parallel circuit, the potential difference (V) across each of the resistors is equal to the e.m.f. (E) if the internal resistance of the cell is ignored. By Ohm’s Law Example 1: For the diagram above,a. find the reading of the ammeter.b. find the current in each of the resistors. Answer:a.Effective … Read more

Finding Current in a Series Circuit In a series circuit, the current flow through each of the resistor is equal to the current flows through the whole circuit. Potential difference (V) across the whole circuit is equal to the e.m.f. (E) if the internal resistance is ignored. Effective resistance for the whole circuit = R1 … Read more

Series Circuit The sum of the potential difference across individual resistor in between 2 points in a series circuit is equal to the potential difference across the two points. V = V1 + V2 Example Parallel Circuit The potential difference across all resistors in a parallel circuit is the same. V = V1 = V2 … Read more

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