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3 years ago

An electric bulb marked 40W-200V is used in a circuit of supply voltage 100V. Now its power is:

Physics

1 answer:

svp [43]3 years ago

7 0

Answer:

Power of the bulb is 10 Watts.

Explanation:

We have,

Power and voltage of electric bulb is 40 W and 200 V. Using this data we can find the resistance of the bulb.

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

R is resistance

$R=\dfrac{V^2}{P}\\\\R=\dfrac{(200)^2}{40}\\\\R=1000\ \Omega$

The supplied voltage is 100 V.

Now power is given by :

$P=\dfrac{V^2}{R}\\\\P=\dfrac{100^2}{1000}\\\\P=10\ W$

So, now the power of the bulb is 10 Watts.

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4 years ago

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a) Answer;

= 6.72 hours

Explanation and solution;

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we take the total distance divided by the total time to get the average.

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