Question

If a bulb is rated 5.0v 100mA ,then calculate its power and resistance

Answer 1

V=IR
5=0.01*R
R=5/0.01=500 ohm...

P=V^2/R
P=25/500=1/20=0.05 W.....

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Answer 2

V=I*R
$r = \frac{v}{i} \\ 1 \: a = 1000ma \\ r = \frac{5}{ \frac{1}{10} } \\ r = 50ohm$

Power=volt*current
P=5*1/10
P=0.5 watt

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