The efficiency of a toaster will be calculated by dividing the output amount of energy by the input amount of energy and then multiplying by 100 to get a percent.

Question

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Answer 1

To calculate the efficiency of a toaster, you can use the following formula:

\[ \text{Efficiency (%)} = \left( \frac{\text{Output Energy}}{\text{Input Energy}} \right) \times 100 \]

Steps to Calculate Efficiency:

1. Determine Input Energy: This is the total energy supplied to the toaster, usually measured in joules (J) or kilowatt-hours (kWh).

2. Determine Output Energy: This is the useful energy the toaster provides in heating the food, which can also be measured in joules (J).

3. Apply the Efficiency Formula: Plug the values of output and input energy into the formula above.

Example Calculation:

• Input Energy: Suppose the toaster uses 1,200 joules of energy.
• Output Energy: Assume the toaster effectively heats the food with 900 joules of energy.

Now, plug in the values:

\[ \text{Efficiency (%)} = \left( \frac{900 , \text{J}}{1200 , \text{J}} \right) \times 100 = 75% \]

In this example, the toaster would have an efficiency of 75%.

Note:

Keep in mind that in real-life applications, not all of the input energy is converted to useful heating energy due to losses such as heat dissipation into the surrounding environment.