Solved Problems I — task. Science State Board, Class 10.

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Two bulbs are having the ratings as $60\ W$ , $220\ V$ and $40\ W$ , $220\ V$ respectively. Which one has a greater resistance?

Electric power is given by the formula,

$P = \frac{i^{i}}{i}$

For the same value of

$V$ , is inversely proportional to .

Therefore, . Hence, the bulb with rating has a greater resistance.

2. Calculate the resistance of a 100

$W$ electric bulb having a voltage of 200

$V$ in an electric circuit.

[Note: Enter the answer as a whole number.]

The formula of power is

$P = i i$

To calculate the current, the formula is

$I = \frac{i}{i}$

The current flowing through an electric bulb is

$A$ .

Now, the value of resistance can be easily calculated using its formula.

$R = \frac{i}{i}$

Thus, the resistance flowing through an 100

$W$ electric bulb with 200

$V$ in an electric circuit is

$Ω$ .

$1$

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21. Solved Problems I

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