The difference between 1hp and 2hp motor is in the power and torque it can provide.
A 1hp motor has less power and torque than a 2hp motor.
For electric motors and other electrical power applications, one horsepower is defined as 746 Watts, so a two horsepower electric motor is capable of providing up to 1492 Watts of power.
One horsepower equals 1.36 Newton-meters of torque at 5252 RPM.
A two horsepower motor would have 2.36 Newton-meters of torque at 5252 RPM.
A typical 1 HP 2875 RPM motor would have 2.49 Newton-meters of torque.
So the motor is 2 horsepower motor times that by 746 watts per horsepower and then, to turn this into regular SI units, and then multiply this 1 hour by 3600 seconds per hour and you end up with 5.4 times 10 to the 6 joules of work when you round to two significant figures.
Electric motors work and operate using principles of electromagnetism, which shows that a force is applied when an electric current is present in a magnetic field.
This force creates a torque on a loop of wire present in the magnetic field, which causes the motor to spin and perform useful work.