Question

B1, B2 and B3 are three identical bulbs connected as shown in Figure 12.8. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.
(i) What happens to the glow of the other two bulbs when the bulb B1 gets fused?
(ii) What happens to the reading of A1, A2, A3 and A when the bulb B2 gets fused?
(iii) How much power is dissipated in the circuit when all the three bulbs glow together

Answer 1

Hint— (i) The glow of the bulbs B2 and B3 will remain the same.
(ii) A1 shows 1 ampere, A2 shows zero, A3 shows 1 ampere and A shows 2 ampere
(iii) P = V I = 4.5 3 = 13.5 W