Question

If a fan of 60 W, two tube lights of 40 W each are
used for 5 hours daily, how much electrical energy
will be consumed? Also find the cost of electricity
for 30 days if the cost of 1 unit is *4.00.​

Answer 1

Answer:

Explanation:total wattage by the appliances=60+40+40=140

so the energy used will be 5x140=700watts

for 30 days 700x30=2100watts or 2.1kwh

cost will be 2100x4=Rs.8400

Answer 2

The consumed energy is 21 units and the cost of electricity is Rs 84.00

Explanation:

Given that,

Power of fan = 60 W

Power of two tube light = 40 W

Time = 5 hours daily

We need to calculate the energy consumed by tube light

Using formula of energy

$E=Pt$

Where, P = power

t = time

Put the value into the formula

$E=2\times40\times5\times30$

$E=12000\ Wh$

$E=12\ kWh$

1 kWh = 1 unit

$E_{t}=12\ unit$

The energy consumed by fan

$E_{f}=60\times5\times 30$

$E_{f}=9000\ wh$

$E_{f}=9\ kWh$

$E_{f}=9\ unit$

The total units consumed

$E'=E_{t}+E_{f}$

$E'=12+9$

$E=21\ unit$

1 unit = 4.00 Rs

We need to calculate the cost of electricity for 30 days

$Cost =21\times4.00$

$Cost=84.00\ Rs$

Hence, The consumed energy is 21 units and the cost of electricity is Rs 84.00

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Topic : Electricity

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