Two bulbs of 40w and 60w are connected to 220v line, the ratio of resistance will be

Two electric bulbs A and B are marked 220 V, 40 W and 220 V, 60 W respectively. Which one of these bulbs has higher resistance?

Given, two electrical bulbs.
Potential across first bulb, V1= 220 V
Power of first bulb, P1= 40 W
Potential across second bulb, V2 = 220 V
Power of second bulb, P2 = 60 WNow,

P = V

/P i.e., R ∝ 1/P.Resistance is inversely proportional to power.

Therefore, the first bulb having lesser power has higher resistance.

Two bulbs marked 'A' 60W, 220V & 'B' 100W, 220V are connected in parallel to 220 volt source. Which of the two will glow brighter?

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

No worries! We‘ve got your back. Try BYJU‘S free classes today!

No worries! We‘ve got your back. Try BYJU‘S free classes today!

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

40 w and 60w of two bulb connected a line which have electric potential 220 volt then find the ratio of resistance

Open in App

Concept:

Electric Power:

• The rate of consumption of electrical energy is called Electric power.
• It is given as 

If the Potential difference is constant, Power is inversely proportional to resistance.

 or 

Power × Resistance is constant

Calculation:

Now, Power of resistance 1 (R1) = P1 = 60 W

Now, Power of resistance 2 (R2) = P2 = 40 W

Now, P1 R1 = P2. R2

So, the required ratio is 2 : 3

Additional Information

The power in terms of current and resistance is given as 

P = I 2 R

I is current

So, If the current would have been constant, the power would have been directly proportional to resistance.

India’s #1 Learning Platform

Start Complete Exam Preparation

Video Lessons & PDF Notes

Get Started for Free Download App

Trusted by 3.2 Crore+ Students