Question

If a bulb, which is marked 60W and 120V.is
connected to a 12V battery, then the consumption
by the bulb is​

Answer 1

Answer:

$Given \: value \: of \: power (<strong>p</strong>) \\ = 60w$

$potential \: difference (<strong>v</strong>) = 120v$

$p = (v \times i)$

I is the current through the bulb,

In first case,

$p \: = (v \times i) \\ 60w = (120v \times i) \\ 0.5 \:ampere \: = i$

Now the power when a 12 V battery is connected,

$p \: = (v2 \times i) \\ p = (12\times 0.5) \\ p = (6w)$

Therefore, the bulb will consume 6 watt of power.

Answer 2

The power consumption by the bulb is 6 watts.

Explanation:

Given that,

A bulb is marked 60 W and 120 V. It is connected to a 12 volts battery. We need to find the power consumption by the bulb. It is given by the formula as :

$P=V\times I$

If power is 60 W,

$I=\dfrac{P}{V}\\\\I=\dfrac{60}{120}\\\\I=0.5\ A$

Power when it is connected to 12 V battery,

$P=V\times I\\\\P=12\ V\times 0.5\ A \\\\P=6\ W$

So, the power consumption by the bulb is 6 watts. Hence, this is the required solution.

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