Question

Consider the following circuits : In which circuit will the power dissipated in the circuit be (I) minimum (II) maximum ? Justify your answer.

Two lamps, rated 100 W; 220 V and 60 W; 220 V are connected in parallel to electric main supply of 220 V. Find the current drawn by the two lamps from the supply.

Assertion (A) : Electrons move from lower potential to higher potential in a conductor. Reason (R) : A dry cell maintains electric potential difference across the ends of a conductor.

Find the current flowing through the following electric circuit :

The potential difference across the two ends of a circuit component is decreased to one-third of its initial value, while its resistance remains constant. What change will be observed in the current flowing through it? Name and state the law which helps us to answer this question.