Which of the following formulas correctly relates energy transfer to power and time?

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Prepare for the KS3 Energy Test. Gain confidence with detailed flashcards and multiple choice questions that cover the core topics. Every question comes with helpful hints and explanations. Equip yourself for success!

The formula that relates energy transfer to power and time is based on the principle that power is the rate at which energy is transferred or converted. Therefore, to find the total energy transferred, you multiply power by the time during which that power is applied.

When energy is measured in joules (J), power is measured in watts (W), and time is measured in seconds (s), the correct relationship is indicated by the formula: Energy (J) = Power (W) x Time (s). This means that if you know the power being used and the duration of time that power is supplied, you can calculate the total energy consumed or produced.

In contrast, the other formulas do not represent the correct relationship between energy, power, and time. For instance, summation and subtraction in the first two options misrepresent how these quantities interact, as energy is not calculated by adding or subtracting time from power. The fourth option incorrectly suggests that energy can be derived by dividing power by time, which does not align with the definitions of these concepts.

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