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First we convert horsepower to watts. 1 Horsepower equals 745.7 watts. Next, using the Ohm's law formula P=IxE where P is power measured in watts; I is current measured in amps; E is voltage measured in volts.
Therefore
5(745.7) / 240 = 15.5 amps
<<>> The current taken by a motor is highly variable depending on efficiency, power factor and the mechanical load. On a 240 v system you should allow 7 amps per HP. So for 5 HP you should allow 35 amps.
Since 2-phase systems went out of use 100 years ago you probably have a single-phase motor which has two suppy wires, a live and a neutral, plus probably an earth wire.
Wiki User
∙ 9y ago
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∙ 11y agoThe 5 horsepower is its output power, so it depends on its efficiency. Once you know that, you can determine its input power and then use the equation:
P = 1.732 EL IL
to determine the line current (IL).
Wiki User
∙ 11y agoTo find the amperage when HP is shown, this formula is used; I = HP x 746/1.73 x E x %eff x pf.
A standard motor's efficiency between 5 to 100 HP is .84 to .91.
A standard motor's power factor between 10 to 100 HP is .86 to .92.
Amps = 3 x 746 = 2238/1.73 x volts x .84 x .84.
As you can see we can go no further as no voltage
was stated.
Wiki User
∙ 14y agoThe single phase AC motor table in the electrical code states a 7.5 HP motor at 230 volts will draw 40 amps.
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∙ 13y agoTo answer this question a voltage must be given.
Wiki User
∙ 13y agoAt least 14 (100% efficient, 1.0pf), likely close to 20 for a real world motor. It depends on the efficiency, load on the motor, and motor power factor.
Wiki User
∙ 13y ago20
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Why 220v in the Phil and 110v to the other country?
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Free
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Power in a 3 phase circuit is given by W=√3*V*I*cosφ therefore transposing the formula gives: I=W/√3*V*cosφ where I=current in amps, W=power in watts, V=line voltage, cosφ=power factor (this should be on the motor plate, if not you could use 0.9) Regards ninenix
How much more efficient is a 2 hp 240 v 3 phase motor compared to a 120 v single phase 2 hp motor?
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For 1 hp motor, a single phase starter is used. Because a single phase starter gives economy consumption,easy trouble shooting and easy installation when compared to three phase starters and supply....
