Question

Calculate the hot resistance value of the lamp 200 watts/250 volts

Answer 1

P=VI

200=250×I

200/250=I

I=4/5 A

V=IR

R=V/I

R=250/4/5

R=250×5/4

R=1250/4

R=312.5ohms

Answer 2

Given that,

Power of lamp, P = 200 W

Voltage, V = 250 V

To find,

Resistance.

Solution,

Power of an resistance is given by :

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

R is Resistance

$R=\dfrac{V^2}{P}\\\\R=\dfrac{(250)^2}{200}\\\\R=312.5\ \Omega$

So, the resistance is 312.5 ohms.

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