128. B1,B2 and B3 are three identical bulbs connected as shown in figure. Ammeters A1, A2 and A3 are connected as shown. When all the bulbs glow, the current of 3 A is recorded by ammeter A. (a) What happens to the glow of the other two bulbs when bulb B1 gets fused? (b) What happens to the reading of A1, A2, A3 and A when the bulb B2 gets fused? (c) How much power is dissipated in the circuit when all the three bulbs Glow together?
Q. 1 When a potential difference of 2V is applied across the ends of a wire of 5m length, a current of 1A is found to flow through it. Calculate (i) the resistance per unit length of the wire (ii) the resistance of 2m length of the wire (iii) the resistance across the ends of the wire if it is doubled on itself?