Question

100 points! show work or else i report

A certain microwave requires 1200 watts. How much would it cost to run the microwave for a total of 30 minutes (defrosting chicken) at a cost of $0.20 per kilowatt hour?

Answer 1

`\boxed{\sf E=Pt}`

E is energy

P is power

t is time in hours

• E=1200(0.5h)
• E=600Wh
• E=0.6Kwh

Cost

• 0.6(0.2)
• $0.12

Answer 2

$0.12

Explanation:

Conversions

1000 watts = 1 kilowatt-hour
⇒ 1200 watts = 1.2 kilowatt-hour

60 minutes = 1 hour
⇒ 30 minutes = 0.5 hour

A microwave requiring 1200 watts will use 1.2 kilowatts per hour.

If the microwave is used for a total of 30 minutes, it will use:

⇒ 1.2 × 0.5 = 0.6 kWh

If the cost is $0.20 per kWh, the cost of running the 1200 watt microwave for 30 minutes is:

⇒ 0.6 × $0.20 = $0.12