Question

which uses more energy , a 250 Watt TV set in 1 hr or a 1200 Watt toaster in 10 min

Answer 1

⭐⭐hey... MATE,⭐⭐

here's ur solution,

a) for TV set,

P = 250
W = 250/1000 kW = 0.25 kW
t = 1 h
so,
electric energy, E = p×t
E = 0.25 × 1 kWh
➡E = 0.25 kWh........................ (1)

b) for toaster :
P = 1200 W = 1200/1000 kW = 1.2 kW
t = 10 min = 10/60h = 0.167 h

so, electric energy,
E = p × t
E = 1.2 × 0.167 kWh
➡E = 0.20 kWh

❇Hey friend !! , from d abv calculation, it is cleared that d TV set uses more energy ( 0. 25 kWh ) whereas toaster uses less energy (0. 20 kWh)

⭐⭐⭐⭐⭐Hope it might be helpful !!

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.