Question

What is resistance of electric bulb of 60 W?​

Answer 1

Answer:

The 120-Watt bulb has the lower resistance; and using Ohm's law, one would expect it also has the higher current. In fact, the 120-Watt bulb would have a current of 1 Amp and a resistance of 120 Ω; the 60-Watt bulb would have a current of 0.5 Amp and a resistance of 240 Ω.

Answer 2

Answer:

The lamp has a working resistance of 960 ohms.

Explanation:

Let us solve the given problem in 2 methods to get a solution

Method 1:

We have p=  v^2/R

Therefore R=  v^2/p

Where R is the resistance of the bulb, p is the power consumption in watt W, V is the voltage which is expressed in terms of volts V

From the given problem we have p=60 W v=240 V

By substituting the values in the equation we get

R=  (240)^2/60

=960 ohms

Method 2:

We have P=IV

Substitute the values

60=240I

I=60/240

=0.25

But we know that

V=RI

240=R x 0.25

R=240/0.25

=960  

Hence the resistance of the bulb=960 ohms  

Note: the rating of bulb is 240V,60W.  Kindly provide the current rating of the appliance in the question next time.

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