Question

a bulb of 220v consume 1 unit in 25 hour determine power & resistance of bulb

Answer 1

By definition 1 watt= 1 joule/sec.

Hence,  40 watts= 40 joules/sec.

For 1 hr
Energy used= 40 x 3600=144000 J.

1 standard unit of electricity i.e. 1 kwh= 3600000 Joules.

Answer 2

The power and resistance is 40 Watt and 1210 Ω.

Explanation:

Given that,

Voltage = 220 V

Time = 25 hour

Energy consume = 1 unit

We need to calculate the power

Using formula of energy consume

$E=P\times t$

$P=\dfrac{E}{t}$

Put the value into the formula

$P=\dfrac{1000}{25}$

$P=40\ Watt$

We need to calculate the resistance

Using formula of power

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

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

Put the value into the formula

$R=\dfrac{220^2}{40}$

$R=1210\ \Omega$

Hence, The power and resistance is 40 Watt and 1210 Ω.

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