Question

a bulb is marked 60w 200 v the current required for its glow is​

Answer 1

Explanation:

Given power of bulb =60W

Voltage=220V

Power =

R

V

2

60=

R

220×220

R=(

60

220×220

)Ω

R=(

6

220×22

)Ω (1)

When voltage = 200V, resistance will be the same

P=

R

200×200

From 1,

=

220×22

200×200×6

22×22

200×20×6

=49.5W

We see that power gets decreased.

Power means rate of consumption of energy, so rate of consumption of energy decreases.

Answer 2

As we know that

P = VI

I = P/ V

given that p= 60 w

and v= 200

then , I = 60/200

= 3/ 10

or, 0.3