Question

Two bulbs marked 60W -220V and 100W -220V joined is series have been connected to 220 volt mains. calculate the amount of current flowing in the circuit​

Answer 1

Explanation:

$hello...... \\ \\ 100 = \frac{ ({i)}^{2} }{r1} \: \: \: \: and \: \: \: 50 = \frac{ {i}^{2} }{r2}$

$from \: here \: you \: will \: get \: r1 \: as = > \\ 484 \\ and \\ r2 \: as = > \\ 968 \\ \\ ratio \: of \: heat \: will \: be = > \\ \frac{h1}{h2} = \frac{ {i}^{2}r1 }{ {i}^{2} r2} \\ \\ remember \: they \: are \: i \: series \: so \: \\ current \: will \: be \: same.. \\ \frac{h1}{h2} = \frac{r1}{r2} = \frac{484}{968} = \frac{1}{2}$