Question

geyser has a rating 2 KVA,240V a) What is the electrical energy consumed by it in joule if it is used for 90 mins. b) If the cost of electricity is₨ 4.50 per commercial unit, find the cost.​

Answer 1

${\dfrac{100 \times SP}{100 - Loss}}$

$\bold{Formula\: :-}$

${\dfrac{100 \times SP}{100 - Loss}}$

CP = $\dfrac{100 \times SP}{100 - Loss\: Percentage}$

Answer 2

Answer:

Given that,

Power of geyser = 200 W

Voltage = 240 V

Time = 1 hr

Cost of electricity = 3.50 ₹

We need to calculate the energy consumed

Using formula of energy consumed

E_{c}=ptE

c

=pt

Put the value into the formula

E_{c}=200\times1E

c

=200×1

E_{c}=0.2\ kWhE

c

=0.2 kWh

We need to calculate the energy consumed in 30 days

Using formula of energy consumed

E=E_{c}\times\text{days}E=E

c

×days

Put the value in to the formula

E=0.2\times30E=0.2×30

E=6\ kWhE=6 kWh

We need to calculate the cost of electricity

Using formula of cost of electricity

\text{total cost}=E\times\text{cost}total cost=E×cost

Put the value into the formula

\text{total cost}=6\times3.50total cost=6×3.50

\text{total cost}=21\ rupeestotal cost=21 rupees

Hence, The total cost is 21 ₹.