## How many amps does a motor draw?

Watts = Horsepower × 746. Watts = Watts ÷ Efficiency. **Amps** = Watts ÷ Volts. **Amps** = (HP × 746) ÷ Efficiency ÷ V.

…**How many amps does** a hp **motor draw**?

Horsepower | Amps |
Voltage |
---|---|---|

1 HP | 6.91 A | 120 V |

1.25 HP | 8.63 A | 120 V |

1.5 HP | 10.4 A | 120 V |

## What is the no load current of 3 phase induction motor?

The three-phase induction motor carries a three-phase winding on its stator. … The no-load current of the motor is sometimes as **high as 30 % to 40 % of the full-load value**.

## Which motor has highest no load speed?

Explanation: At no load, armature current tends to zero, flux φ tends to zero, where speed is inversely proportional to the flux, speed will tend to infinity. Thus, no load speed of **DC series motor** is highest.

## What is full load current of motor?

Definition of ‘full load current’

A full load current is **the largest current that a motor or other device is designed to carry under particular conditions**. … A full load current is the largest current that a motor or other device is designed to carry under particular conditions.

## What size breaker do I need for a 10 amp motor?

Full Load Current: Three Phase AC Motors

Motor Horsepower | Size Breaker | |
---|---|---|

5 | 230V 460V | 15 15 |

7-1/2 | 230V 460V | 40 30 |

10 | 230V 460V | 50 30 |

15 | 230V 460V | 70 40 |

## What size breaker do I need for a 20 amp motor?

Use **12-gauge wire** for a 20-amp circuit, 10-gauge for 30 amps, 8-gauge for 40 amps, and 6-gauge for 50 amps.

## How many amps is 3 horsepower?

Common Horsepower to Amps Conversions

Horsepower | Amps | Efficiency |
---|---|---|

3 HP | 20.7 A |
90% |

3.5 HP | 24.2 A | 90% |

4 HP | 27.6 A | 90% |

4.5 HP | 31.1 A | 90% |

## Why is no load current small?

This is due to the fact that the no-load current of 3 **amperes is very small compared** to the larger 56 amperes drawn by the primary winding from the supply. So the primary and secondary windings of a transformer possess both resistance and reactance.

## What happens if there is no load in a circuit?

This process of electricity doing work in a circuit is called load. Without having a load, or some work for electricity to do, then there is **no point** in having a circuit.

## What is full load current of a 3 phase motor?

3 phase 415V, at 0.8 pf, 1 Hp motor full load current = **1.3 Amps**. 1 Phase 230V, at 0.8 pf, 1 Hp motor full load current = 4 Amps.

## How do you calculate motor load capacity?

Por = Nameplate rated horsepower Load = Output power as a % of rated power Pi = Three-phase power in **kW η = 0.7457 x hp x Load Pi** Page 8 8 By definition, a motor of a given rated horsepower is expected to deliver that quantity of power in a mechanical form at the motor shaft.

## What is loading of motor?

A motor is a device that converts electrical energy into mechanical energy to **act upon a mechanical load**. The burden placed on the motor due to this mechanical activity is referred to as the motor load. … Damage to a motor may occur when it is operated under excessive motor load compared to its rated capacity.