Question

Andy works 8 hours and leaves a certain radio on all day. This radio requires 150 watts of electricity. At a price per kilowatt-hour of $0.10, how much will it cost to run the radio for his 8-hour work day?

Answer 1

The cost to run the radio for 8 hours work day is $0.12

Explanation:

Given as :

The working hour of Andy = 8 hours

The power consumption of radio = 150 watts

The price per kilowatt-hour = $0.10

Let The cost to run the radio for 8 hours = $x

Now, According to question

The energy rating of radio = power consumption × number of working hours

So,

The energy rating of radio = 150 watts × 8 hours

Or, The energy rating of radio = 1200 watts-hour

∵ 1000 watts = 1 kilo-watt

So, 1200 watts =
`(1200)/(1000)` kilo-watt

Or, 1200 watts = 1.2 kilo-watt

∴ The energy rating of radio = 1.2 kilo watts-hour

Now, since The price for energy of 1 kilo-watt hour = $0.10

∴ The price for energy of 1.2 kilo-watt hour = $0.10 × 1.2

Or, The price for energy of 1.2 kilo-watt hour = $0.12

Hence The cost to run the radio for 8 hours work day is $0.12 Answer