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Two.
More Information:Refer to the electrical formula:Amps * Volts = Watts
The above answer is correct for HOUSEHOLD bulbs in the U.S. or Canada where we use 120V.
A * 120V = (60 * 4)
A = (60*4)/120
A = 240/120
A = 2
But of course, the answer would be different if the bulb voltage were different.
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