Question

Three bulbs of resistance 180 v and 40 w

Answer 1

Answer:-

• Power=P=40W
• Voltage=V=180V
• Resistance=R=?

We know

$\boxed{\sf P=\dfrac{V^2}{R}}$

$\\ \sf\longmapsto R=\dfrac{V^2}{P}$

$\\ \sf\longmapsto R=\dfrac{180^2}{40}$

$\\ \sf\longmapsto R=\dfrac{32400}{40}$

$\\ \sf\longmapsto R=810\Omega$