Question

three identical lamps A,B and C are connected in series across a 150 V supply. state a) the voltage across each lamp and b) the effect of lamp C failing​

Answer 1

Answer:

See t the attachment

Explanation:

Answer 2

Answer:

(a)The voltage across each lamp is 50V

(b) The effect of lamp C failing​ is that no bulb will glow.

Explanation:

As all the bulbs are identical all three of them will have the same value of resistance and as they are connected in series the current through them will remain the same.

The net voltage will be divided equally between all three bulbs because of equal current and resistance.

(a) The voltage across each lamp,

$V'=\frac{V_n}{3}$         (1)

Where,

V'=voltage across each lamp

Vn=net voltage

From question,

Vn=150V

By substituting the value of Vn in equation (1) we get;

$V'=\frac{150}{3}=50V$

(b)When the lamp C fails then the circuit will break and no current will flow through the bulbs as they are connected in series. So, no bulb will glow.

Hence, the voltage across each lamp is 50V and the effect of lamp C failing​ is that no bulb will glow.