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The duration for which the wave travels, measured in seconds (s).

The duration of an energy transfer or of work being done, measured in seconds (s) in the power equations.

Two machines can transfer the same amount of energy but have different powers because one completes the transfer in less time. Conversely, a low-power device can eventually transfer more energy than a high-power device if it operates for much longer.

A measure of how long an event or journey lasts, commonly measured in seconds (s).

Speed describes how much distance an object covers in a given time.

The duration for which the current flows, measured in seconds (s).

Convert all times to seconds before using the power equations; for example, multiply minutes by 60.

Do not assume that a more powerful device must transfer more energy overall. Power compares energy transferred per second, so the operating time matters.

When comparing machines that do the same work, the one taking less time has the greater power. State both the comparison and the reason.