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Which uses more energy, a $250 W$ TV set in $1 hour$ , or a $1200 W$ toaster in $10 minutes$ ?

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TV Set

Toaster

Both use same energy

None

answer is A.

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Detailed Solution

250 W

TV set in

1 hour

uses more energy than a

1200 W

toaster in

10 minutes

.
Given, TV power (

P_{1}

)

= 250 W

;

TV time (t_{1}) = 1 hr = 3600 \sec

Toaster power (

P_{2}

)

= 1200 W

;

toster time (t_{2}) = 10 \min

The energy consumed by an electrical appliance is given by the expression

E = P \times t

, where

P = power of the appliance

and

t = time

Now, energy consumption by a

250 W

TV set in one hour

E_{TV} = P_{1} \times t_{1}

……………… (i)
Put above values in equation (i) we get,

E_{TV} = 250 \times 3600

E_{TV} = 9 \times 10^{5} J

………………… (ii)
Energy consumed by a

1200 W

toaster in 10 minutes

E_{Toaster} = P_{2} \times t_{2}

……………. (iii)

E_{Toaster} = 1200 \times 600

E_{Toaster} = 7.2 \times 10^{5} J

. ………………….. (iv)
Comparing (iii) and (iv) equations we can say, energy consumption is more for Tv rather than toaster.

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