With a 1220–W toaster, how much electrical energy is needed to make a slice of toast (cooking time = 1.3 minute)?

At 12.1 cents/kW·h, how much does this cost? (You do not need to enter any units.)

energy= power*timeinsecond=1220*60*1.3 Joules

cost=1.22Kw*1.3/60 hr * 12.1 cents/kwhr

1220 Joules/second * 1.3*60 seconds

= 95,160 Joules

1.220 kW * 1.3 min * 1 hr/60 min

= .0264333333333..... kW h

* 12.1 cents = .32 cents

To calculate the electrical energy needed to make a slice of toast, we can use the formula:

Energy (in kilowatt-hours) = Power (in kilowatts) × Time (in hours)

First, let's convert the cooking time to hours. Since 1 hour = 60 minutes, we have:

Time = 1.3 minutes ÷ 60 minutes/hour

Time = 0.0217 hours (rounded to 4 decimal places)

Now, we can calculate the electrical energy:

Energy = 1.22 kilowatts × 0.0217 hours

Energy = 0.02647 kilowatt-hours (rounded to 5 decimal places)

To calculate the cost, we can multiply the energy consumption in kilowatt-hours by the cost per kilowatt-hour:

Cost = Energy (in kilowatt-hours) × Cost per kilowatt-hour

With a cost of 12.1 cents/kW·h, or $0.121/kW·h, we have:

Cost = 0.02647 kilowatt-hours × $0.121/kW·h

Cost = $0.00320 (rounded to 5 decimal places)

Therefore, it would cost approximately $0.00320 to make a slice of toast using a 1220-W toaster.

To calculate the electrical energy needed to make a slice of toast, you can use the formula:

Energy (in kilowatt-hours) = Power (in kilowatts) x Time (in hours)

First, convert the power of the toaster from watts to kilowatts by dividing by 1000:

Power (in kilowatts) = 1220 W / 1000 = 1.22 kW

Next, convert the cooking time from minutes to hours by dividing by 60:

Time (in hours) = 1.3 minutes / 60 = 0.0217 hours

Now, plug in the values into the formula:

Energy (in kilowatt-hours) = 1.22 kW x 0.0217 hours = 0.0265 kilowatt-hours (kW·h)

To calculate the cost, multiply the energy usage in kilowatt-hours by the cost per kilowatt-hour:

Cost = Energy (in kilowatt-hours) x Cost per kilowatt-hour

In this case, the cost per kilowatt-hour is given as 12.1 cents/kW·h. However, we need to convert it to dollars, so divide by 100:

Cost per kilowatt-hour = 12.1 cents / 100 = $0.121/kW·h

Now, multiply the energy usage by the cost per kilowatt-hour:

Cost = 0.0265 kW·h x $0.121/kW·h = $0.0032

Therefore, the cost to make a slice of toast using a 1220-W toaster for 1.3 minutes is approximately $0.0032.