Question

the 60 w light bulb in fig. 2.122 is rated at 120 volts. calculate the value of v s to make the light bulb operate at its rated conditions

Answer 1

To operate the bulb at the rated conditions, we should use a EMF source of 77.45V.

The light bulb is rated 60W and 110V. The bulb is connected to a resistance of 100 ohms.

In order to operate the bulb at the rated conditions, let us say we connected it to the voltage Vs,

we cam use the relation,

P = V²/R

Where,

V is the voltage to be used,

R is the resistance of the circuit.

Now, putting values,

60 = V²/100

V = 6000

V = 77.45V.

So, in order to operate the bulb at the rated conditions we should use a voltage sources of 77.45V.

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