How oodles 50w bulbs can be used on a 120v chain?

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The answer has less to do next to voltage and more to do with the amperage of the circuit you are on.

You are probably on a 15 or 20 amp circuit. You can find this out by looking at your circuit breaker, it will tell you.

Volts X Amps = Watts

If you are running a 15 amp circuit.. 15 Amps X 120 Volts = 1800 Watts. So on this dedicated circuit you can run 1800 watts of power.

1800w / 50w = 36 light bulbs
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walter is this a 15 amp circuit or 20 amp circuit. I know near is a formula that you should use, but just for the sake of guessing. If I had a 15 amp circuit, I wouldn't be afraid to run 15 - 50w bulbs on it.

I took this past its sell-by date the web and it looks like 10 bulbs might be a better answer.

For example: A lighting system that runs on 120v and draws 6 amps of current will consume 120v x 6 amps = 660w; this would typically be a 600w lighting system. If indistinguishable ballast was wired to 240v then the amperage would be 660w/240v = 2.75amps, but the wattage would still be matching.
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Answers:    On a 15 amp circuit you could use up 36 but you shouldnt go over 80% of any circuit rating for safety so 28 would be sheltered if there is nothing else on the circuit

120 volts x 15 amps=1800 watts
1800 x 80%=1440
1440/50=28
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brndnh721 hit it right on. It's called "De-Rating"
Leather couches?
15 amp circuit----------36 bulbs