Question

A power plant has 4 tons of coal. A ton produces 2,460 kilowatt hours of electricity. Is this enough to power 9 light bulbs for a year? Explain. It takes 876 kilowatt hours of electricity to power a 100-watt light bulb for a year.

Answer 1

Since the required energy is less than the produced energy, the power is sufficient to light 9 light bulbs.

Explanation:

A power plant has 4 tons of coal. A ton produces 2,460 kilowatt hours of electricity.

It takes 876 kilowatt hours of electricity to power a 100-watt light bulb for a year.

We have to light 9 bulbs a year.

So the required energy = 9
`*` 876 = 7884 kilowatt hours.

Power plant produces 4 tons of coal, so power = 4
`* 2460`

= 9840 kilowatt hours.

Since the required energy is less than the produced energy, the power is sufficient to light 9 light bulbs.