Question

An electric bulb is labelled at 100w-220v. the bulb is connected to a supply of 120v. the heat produced by the bulb for 2 min​

Answer 1

The heat produced is 3528 J.

Explanation:

Given that,

Power = 100 w

Voltage = 220 V

Time = 2 min

We need to calculate the current

Using formula of power

$P=VI$

Put the value into the formula

$100=220\times I$

$I=\dfrac{100}{220}$

$I=0.45\ A$

We need to calculate the resistance

Using ohm's law

$V=IR$

$R=\dfrac{V}{I}$

Put the value into the formula

$R=\dfrac{220}{0.45}$

$R=488.8\ \Omega$

We need to calculate the power

Using formula of power

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

Put the value into the formula

$P=\dfrac{120^2}{488.8}$

$P=29.4\ Watt$

We need to calculate the heat produced

Using formula of heat

$E=Pt$

Put the value into the formula

$E=29.4\times2\times60$

$E=3528\ J$

Hence, The heat produced is 3528 J.

Learn more :

Topic : Power

https://brainly.in/question/2935797

Answer 2

Explanation:

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