Question

A torch bulb is rated 2v.500mA.calculate its ,power,resistance

Answer 1

Hi mate.



Thanks for asking this question.



Here is your answer,





Given :

(1) V =2v

(2) I = 500mA = 0.5 A

(3) P = ?

(4) R = ?




We know that,




According to the ohms law,


V = I R

putting the given values,

2 = 0.5 × R

2 / 0.5 = R


Therefore,

R = 4 ohm.





Again according to the joules law,



$p \: = {i}^{2} r$


$p \: = {0.5}^{2} \times 4$


$p \: = 0.25 \times 4$


$p \: = 1 \: watt.$









Thank you.







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