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I'm assuming this is standard residential single phase. Simple calculation as noted below:
Watts / Volts = Amps
So: 200 Watts / 120 Volts = 1.666~ Amps
If you needed to calculate for a 220 volt run with the same 200 Watts
200 Watts / 220 Volts = 0.909~ Amps
Remember 80% load per circuit breaker so a 15 amp breaker you should only load to 12 amps or less. Using Watt / Volts = Amps is the same as Amps x Volts = Watts.
15 Amps X .8 (80%) = 12 Amps max per circuit (for a 15 amp breaker/fuse)
So 12 Amps x 120 Volts = 1440 Watts max for a 15 amp circuit (typical 14 gauge wire)
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If a 20 amp circuit and 12 gauge wire (smaller gauge = larger dia wire).
20 Amps X .8 (80%) = 16 Amps max per circuit
So 16 Amps x 120 Volts = 1920 Watts max for a 20 amp circuit (typical 12 gauge wire)
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoSince P = V2/R, you can easily manipulate this equation and find the answer for yourself. Bear in mind that this will give you the 'hot' resistance; the resistance will be very much lower when the lamp is cold.
Wiki User
∙ 13y agoPower = V2 / Resistance
Resistance = V2 / Power = (120)2 / 100 = 14,400/100 = 144 ohms
Wiki User
∙ 13y agoP=I*E and I=E/R so P=E^2/R.
So R=(E^2)/P and R=(120v)^2/200w = 72 ohms
Wiki User
∙ 13y agoAbout 144 ohms. This assumes the bulb is rated at 120 volts. You might find it rated anywhere from 110v to 130v, which in normal usage means nothing. But it may mean a different resistance.
Anonymous
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What draw in amps is a standard brake light?
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How many amps does a two-bulb 32 watt 48-inch fluorescent light draw?
draw 0.104 amps
How much amperage a 194 series bulb draws?
The 194 bulb is ~3.8 watts, at 14 volts they draw 0.271 amps.
How many amps does 65 watt light bulb draw?
A 65 Watt incandescent light bulb should draw 65W/120V = 541.67mA
Do a 12 volt 50 watt bulb and a 230 volt 50 watt bulb draw the same current?
A 50 watt bulb designed to run on 12 volts takes 4.17 amps. A 50 watt bulb designed to run on 230 volts takes 0.217 amps.
How much electricticity is used with a 50 watt low volt light?
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How does a 10 watts bulb work in a series connection?
A 10 watt bulb is defined by the voltage supply and the resulting current. So to make the math simple, suppose you have a 10 watt incandescent bulb designed to work at 20 volts. That means it will draw 1/2 amps. Watts = Volts x Amps. The resistance of the bulb is then Volts / Amps so in this case the resistance of the bulb would be 40 ohms. So our mythical bulb has a resistance of 40 ohms with 20 volts across the bulb in our example. Now if we put two of these bulbs in series with the same 20 volts we now have a total resistance of 80 ohms supplied by 20 volts and the circuit will draw 1/4 amp. This lower current will cause the bulbs to be dimmer.
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If the light is operating at 110 volts, and P = I x E, then I = 300/110, or 2.5 amps.
How many amps does a 120v 50w halogen light bulb use?
At what voltage? Until you tell me the voltage I can't give you an answer. To find out Amps you need to divide the Watts by the Volts. At 120V you have 0.4 amps. At 12V you have 4 amps.
