Question

Two devices of rating 22 W; 220 V and 11 W ; 220 V are connected in series. The combination is

connected across a 440 V mains. The fuse of which of the two devices is likely to burn when

switch is on ? Justify your name.​

Answer 1

Question:

● Two devices of rating 22 W ; 220 V and 11 W ; 220 V are connected in series. The combination is  connected across a 440 V mains. The fuse of which of the two devices is likely to burn when  switch is on?

Answer:

Given:

Device 1 :

● Power = 22 W

● Voltage = 220 V

Device 2 :

● Power = 11 W  

● Voltage = 220 V

To Find:  

● The device which is likely to burn when switch is on?

Solution:

☯ P = V²/R

☯ I ∝ 1/R

✭ According to the Question :

For Device 1,

→ P = V²/R

→ 22 = 220²/R

→ R = 48400/22

→ R = 2200 Ω

For Device 2,

→ P = V²/R  

→ 11 = 220²/R

→ R = 48400/11

→ R = 4400 Ω

● So, the device with the highest resistance would consume lesser current as I (current) is inversely proportional to R (resistance).

∴ The device with P = 22 W is likely to burn when switch is on (Device 1).

Answer: Device 1 is likely to burn when switch is on.

Hope it helps you!!(●'◡'●)

Answer 2

Answer:

Explanation:

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