Question

A fluorescent lamp used in a normal household has a power of 40 W. If the cost per unit of electrical energy used is 20 cents, what is the cost of switching on the fluorescent lamp for 20 hours? ​

Answer 1

Answer:

$160

Step-by-step explanation:

We know

Power of the fluorescent lamp = 40 W

Duration of switching on the lamp = 20 hours

Cost per unit of electrical energy = $0.20

What is the cost of switching on the fluorescent lamp for 20 hours?

First, we have to find the amount of power consumed.

40 · 20 = 800 W

Then, to find the cost, we take

800 · 0.2 = $160

So, switching on the fluorescent lamp for 20 hours would cost $160.

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