Physics, asked by nkk47, 1 year ago

an electric bulb of resistance 480 ohm is connected to a 220 volt mains find the amount of electrical energy consumed in 10 seconds

Answers

Answered by Anonymous

Ans.
1008.33j
As, H=i2RT

nkk47: whats b and s

nkk47: in this is h=?

nkk47: i=?

nkk47: r=220v

nkk47: t=10s

nkk47: 10

Answered by RohitKawade

$E= \frac{{V}^{2} }{R} t \\ \: \: \: \: \: = \frac{ {220}^{2} }{480} \times 10 \\ \: \: \: \: \: = 1008.34 \: J \:$

nkk47: but tell me is this any formula?

nkk47: and can it be used as 10th board exam?

RohitKawade: H = l^2 ×R × t. then replace l by V/R.

RohitKawade: ok

nkk47: but why we have to replace i by v/r

RohitKawade: because we know potential difference and resistance but not current so we replace I by v divide by R

nkk47: v/r is any formula?

RohitKawade: V = l / R ( ohms law )

RohitKawade: l = V / R

RohitKawade: sorry ,V = l×R (ohms law)

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