Q1. Three resistances of 3Ω, 4Ω and 5Ω are connected in series in a circuit in which a battery of 6 V is also connected. Which of the following statements is/are correct? (a) The potential difference across all the resistances is the same. (b) The current in each resistance is the same. (c) The equivalent resistance of the combination is 12Ω. (d) The current in the circuit is 0.5 A. Choose the most appropriate answer from the options given below:
Explanation
In a series circuit, the same current flows through every resistance, so the current statement is correct. The equivalent resistance is the sum of 3Ω, 4Ω and 5Ω, which is 12Ω. With a 6 V battery, Ohm's law gives current as 6 divided by 12, or 0.5 A. The potential difference across each resistance is not the same because voltage drops are proportional to resistance in series. Therefore only the current, equivalent-resistance and circuit-current statements are correct.