Physics

Problem

The marking “60 W – 230 V” is printed on an incandescent lamp. What does this marking indicate? a) The lamp draws a current of

60\ \text{A}

when connected to a

230\ \text{V}

supply. b) The lamp converts electrical energy at

60\ \text{J s}^{-1}

when connected to

230\ \text{V}

. c) The filament resistance is

60\ \Omega

at its rated voltage of

230\ \text{V}

. d) The lamp converts

60\ \text{J}

of electrical energy in

230\ \text{s}

irrespective of the supply voltage.