Q4 of 330 Page 58

An electric bulb is rated at 220 V, 100 W. What is its resistance?

Here, V = 220 V, P = 100W

R = ?


We know that



Thus


R = V2/P = 2202/100 = 484 ohm


More from this chapter

All 330 →
2

Which one has a higher electrical resistance: a 100-watt bulb or a 60 watt bulb?

 3

Name the commercial unit of electric energy.

 5

What is the SI unit of (i) electric energy, and (ii) electric power?

 6

Name the quantity whose unit is (i) kilowatt, and (ii) kilowatt-hour.