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WireWorks
The most basic electrical formula — volts times amps equals watts.
P = V × I is exact for purely resistive loads (like a heater or incandescent bulb). Motors and other inductive loads have a 'power factor' below 1, meaning actual real power is somewhat less than volts × amps suggests.
Knowing an appliance's wattage lets you check it against a circuit's capacity (amps × voltage) or a generator's rated output — always leave headroom rather than loading a circuit to its exact rated maximum.
Watts
1,200 W
P = V × I is the basic power formula for a purely resistive load — motors and other reactive loads need a power factor adjustment.
What you entered
Apply P = V × I
120 × 10= 1200 WResult
Watts: 1,200 W
120 V at 10 A draws 1200 watts of power.