Did you know that when you adjust the power level of a microwave oven you are actually adjusting the amount of time that the oven is cooking rather than the actual power ? The power output cannot be adjusted. This is achieved by a simple reduction in the actual cooking time in relation to the cooking time selected by the user. For instance. 100% power means that the oven is cooking all the time it is running. If 50% power is chosen, the oven will switch on and off during the cook time so that the total time it was actually cooking was only 50% of the cooking time selected. The same applied for all powers.