Fig. 12.10 A and B, show a bulb connected to a cell in two different ways.
(i) What will be the direction of the current through the bulb in both the cases. (Q to P or P to Q)
(ii) Will the bulb glow in both the cases?
(iii) Does the brightness of the glowing bulb depend on the direction of current through it?
(i) We know that direction of current flow is always from positive terminal of battery to negative terminal through the whole circuit. So,
● in first case, the direction of current flow is from Q to P
● in second case it is from P to Q.
(ii) Yes the bulb will glow in both cases as there is flow of current through circuit in both the cases.
(iii) No, the brightness of glowing bulb does not depend on direction of current flow. It just depends on amount of current and voltage through it.