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Yes. It should be a 'heavy-duty' extension cord, rated for 15A or 20A .
Microwave oven
Yes, and extension cord can be used with a microwave. But it is critical to pick an extension cord with a sufficiently high rating on it. Hardware stores and large home stores have extension cords specifically for use as appliance extension cords. They are heavy, and they have only a single place on the end to plug something into. They cost a bit, but are worth it in peace of mind.
The most common wire size for an extension cord to use would be a #14 conductor. As extension cords are classed as flexible cords, the proper terminology would be a 3C/14. The cord consists of three #14 conductors, whose colouring is white, black and green covered by a plastic sheath.
I think you mean 14 &13 amps, not volts. You should never exceed the rating of an extension cord. A safe margin is a good idea- something like 150-200% of the expected load (21 to 28A in this case). One way to know if you are pushing it is to hold on to the cord after the oven has been running for a few minutes. Also test the junction of the extension cord and the power cord to be sure there is no significant heating.
Microwave oven is used to create microwave radiation of suitable freq....
heat energy
plate
A microwave oven uses electrical energy (which is electromagnetic energy) from the mains, and it generates microwave energy (which is also electromagnetic energy) to heat/cook food items.
You can't. Only if it's a microwave-oven
A convection oven moves the air, a microwave does not.
Heat energy