Question

which consumes more energy a 250 watt TV set in 1 hour or a 1200 watt toaster in 10 minutes if one unit consumes 6 rupees what is the first cost of energy

Answer 1

energy of tv = 250/1000*1
= 0.25kWh
so tv consumes more energy.

energy of toaster = 1200/1000*10/60
= 1.2*1/6
= 0.20 kWh
1 kWh = 1unit
0.25 unit * 6
= ₹1.5
0.2unit *6
= ₹1.2
total cost = ₹1.5+₹1.2
= ₹2.7

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Answer 2

⇒ Power (P) TV = 250 W

⇒ Time Taken (t) = 1 hr

⇒ Heat = Power × Time

⇒ H = Pt

⇒ 250 W × 1hr

⇒ 250 Wh

therefore , the energy consumed by 250 W TV set in 1 hr = 250 Wh.

⇒ Power (P) Toaster = 1200 W

⇒ Time Taken (t) = 10 minutes

⇒ H = Pt

⇒ 1200 × 10/60

⇒ 200 Wh.

Therefore, Energy consumed by TV set is more than by the toaster in the giving timing.