The Japanese often use wattage to specify the output of electric motors. It's easier to use if you're engineering an application involving it. On power tools, American manufacturers generally prefer specifying amperage and voltage.
For power tools using AC/DC motors (DC machines with brushes and commutator), the wattage can be closely approximated by multiplying the amperage by the voltage. The amperage can be calculated by dividing the wattage by the voltage. It's not really important whether the tool's power is specified by amperage-voltage or by wattage. It's just a matter of manufacturer preference and industry standard.
Keep in mind that these formulas don't apply to AC induction motors such as capacitor start or shade pole. Many table saws use capacitor start motors.
The 13 Amp rating on the motor is not what it will draw under normal load but rather when it is being pushed a little hard typically through a rip. You can exceed this amperage draw if you really drag down the motor. this will heat up the breaker and trip it, or if you have too big of rated breaker will start to smoke the motor.
Remember all things electric or electronic have smoke inside them and when you let it out you have ruined them:)
I stands for current in amps
E stands for electromotive force in volts sometimes V
R is resistance in Ohms
P is power in Watts
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