Question

A 2kW heater a 200w tv and three 150w lamps are all switched on from 6 a.m. to 10 p.m. what is the total cost at Rs. 8.50 per kWh? please answer this fast I'll mark you the brainliest.​

Answer 1

Given

• Power of Heater = 2 kW
• Power of TV = 150 W
• Power of lamps = 3 × 150 = 450 W
• Time = 6 am - 10 pm = 16 hours
• Cost per unit = ₹8.5

To Find

• Cost for the day

Solution

● E = P × t

✭ Converting Units :

• Power of TV = 150 W = 150/1000 = 0.15 kW
• Power of Lamps = 450/1000 = 0.45 kW

✭ Energy Consumed by Heater :

→ E = P × t

→ E = 2 × 16

→ E = 32 kWh

✭ Energy Consumed by TV :

→ E = P × t

→ E = 0.15 × 16

→ E = 2.4 kWh

✭ Energy Consumed by Lamps :

→ E = P × t

→ E = 0.45 × 16

→ E = 7.2 kWh

✭ Total Energy Consumed :

→ Total Energy = Energy (heater) + Energy (TV) + Energy (Lamps)

→ Total Energy = 32 + 2.4 + 7.2

→ Total Energy = 1658.88 kWh

✭ Electric Cost :

→ Cost = Cost per unit × Total Energy

→ Cost = 8.5 × 1658.88

→ Cost = ₹14100.48

Answer 2

Answer:-

Answer:-

$\small \bf \underline{Given:}$

★★Power of heater = 2kW

★★Power of TV = $\small \bf200W = \frac{200}{1000} = 0.2$

★★Power of lamps = 3 × 150 = 450W$\small \bf = \frac{450}{1000} = 0.45kW$

★★Time = 6am to 10pm = 16hours

★★Cost per kWh = ₹8.50

$\small \bf \underline{To \: find:}$

Total cost for the day

$\small \bf \underline{Solution:}$

» Energy consumed by the heater :-

Energy consumed by the heater = Power of heater × Time

Energy consumed by the heater = 2 × 16

Energy consumed by the heater = 32kWh

»Energy consumed by TV :-

Energy consumed by TV = Power of TV × Time

Energy consumed by TV = 0.2 × 16

Energy consumed by TV = 3.2kWh

»Energy consumed by lamps :-

Energy consumed by lamps = Power of lamps × Time

Energy consumed by lamps = 0.45 × 16

Energy consumed by lamps = 7.2kWh

»Total energy consumed :-

Total energy consumed = Energy of heater + Energy

of TV + Energy of lamps

Total energy consumed = 32 + 3.2+ 7.2

Total energy consumed = 42.4kWh

»Electrical Cost :-

Electrical Cost = Cost per kWh × Total energy

Electrical Cost = 8.5 × 42.4

Electrical Cost = ₹ 360.40

@BengaliBeauty

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